Editor zoom: add zoom_to_extents()
[ardour.git] / gtk2_ardour / editor.cc
index 17ed10e68d85eb87b5c2a60318f955326c2eeae7..210f6350befe8e38c7ab4f938a0f15c9987b69e8 100644 (file)
 #include <gtkmm/menuitem.h>
 
 #include "gtkmm2ext/bindings.h"
-#include "gtkmm2ext/grouped_buttons.h"
 #include "gtkmm2ext/gtk_ui.h"
-#include <gtkmm2ext/keyboard.h>
+#include "gtkmm2ext/keyboard.h"
 #include "gtkmm2ext/utils.h"
 #include "gtkmm2ext/window_title.h"
-#include "gtkmm2ext/choice.h"
 #include "gtkmm2ext/cell_renderer_pixbuf_toggle.h"
 
 #include "ardour/analysis_graph.h"
 #include "canvas/debug.h"
 #include "canvas/text.h"
 
+#include "widgets/ardour_spacer.h"
+#include "widgets/eventboxext.h"
+#include "widgets/tooltips.h"
+
 #include "control_protocol/control_protocol.h"
 
 #include "actions.h"
 #include "analysis_window.h"
-#include "ardour_spacer.h"
 #include "audio_clock.h"
 #include "audio_region_view.h"
 #include "audio_streamview.h"
@@ -97,6 +98,7 @@
 #include "crossfade_edit.h"
 #include "debug.h"
 #include "editing.h"
+#include "editing_convert.h"
 #include "editor.h"
 #include "editor_cursors.h"
 #include "editor_drag.h"
 #include "editor_routes.h"
 #include "editor_snapshots.h"
 #include "editor_summary.h"
+#include "enums_convert.h"
 #include "export_report.h"
 #include "global_port_matrix.h"
 #include "gui_object.h"
 #include "gui_thread.h"
 #include "keyboard.h"
-#include "keyeditor.h"
 #include "luainstance.h"
 #include "marker.h"
 #include "midi_region_view.h"
 #include "time_axis_view.h"
 #include "time_info_box.h"
 #include "timers.h"
-#include "tooltips.h"
 #include "ui_config.h"
 #include "utils.h"
 #include "vca_time_axis.h"
 
 using namespace std;
 using namespace ARDOUR;
+using namespace ArdourWidgets;
 using namespace ARDOUR_UI_UTILS;
 using namespace PBD;
 using namespace Gtk;
@@ -300,9 +302,11 @@ Editor::Editor ()
        , minsec_mark_interval (0)
        , minsec_mark_modulo (0)
        , minsec_nmarks (0)
+       , timecode_ruler_scale (timecode_show_many_hours)
        , timecode_mark_modulo (0)
        , timecode_nmarks (0)
        , _samples_ruler_interval (0)
+       , bbt_ruler_scale (bbt_show_many)
        , bbt_bars (0)
        , bbt_nmarks (0)
        , bbt_bar_helper_on (0)
@@ -343,11 +347,13 @@ Editor::Editor ()
        , _full_canvas_height (0)
        , edit_controls_left_menu (0)
        , edit_controls_right_menu (0)
-       , last_update_frame (0)
+       , visual_change_queued(false)
+       , _last_update_time (0)
+       , _err_screen_engine (0)
        , cut_buffer_start (0)
        , cut_buffer_length (0)
        , button_bindings (0)
-       , last_paste_pos (0)
+       , last_paste_pos (-1)
        , paste_count (0)
        , sfbrowser (0)
        , current_interthread_info (0)
@@ -387,12 +393,13 @@ Editor::Editor ()
        , _visible_track_count (-1)
        ,  toolbar_selection_clock_table (2,3)
        ,  automation_mode_button (_("mode"))
-       , selection (new Selection (this))
-       , cut_buffer (new Selection (this))
+       , selection (new Selection (this, true))
+       , cut_buffer (new Selection (this, false))
        , _selection_memento (new SelectionMemento())
        , _all_region_actions_sensitized (false)
        , _ignore_region_action (false)
        , _last_region_menu_was_main (false)
+       , _track_selection_change_without_scroll (false)
        , cd_marker_bar_drag_rect (0)
        , range_bar_drag_rect (0)
        , transport_bar_drag_rect (0)
@@ -487,7 +494,7 @@ Editor::Editor ()
        location_loop_color = UIConfiguration::instance().color ("location loop");
        location_punch_color = UIConfiguration::instance().color ("location punch");
 
-       timebar_height = std::max(12., ceil (15. * ARDOUR_UI::ui_scale));
+       timebar_height = std::max (12., ceil (15. * UIConfiguration::instance().get_ui_scale()));
 
        TimeAxisView::setup_sizes ();
        ArdourMarker::setup_sizes (timebar_height);
@@ -578,7 +585,6 @@ Editor::Editor ()
        _summary = new EditorSummary (this);
 
        selection->TimeChanged.connect (sigc::mem_fun(*this, &Editor::time_selection_changed));
-       selection->TracksChanged.connect (sigc::mem_fun(*this, &Editor::track_selection_changed));
 
        editor_regions_selection_changed_connection = selection->RegionsChanged.connect (sigc::mem_fun(*this, &Editor::region_selection_changed));
 
@@ -639,12 +645,14 @@ Editor::Editor ()
        bottom_hbox.set_border_width (2);
        bottom_hbox.set_spacing (3);
 
+       PresentationInfo::Change.connect (*this, MISSING_INVALIDATOR, boost::bind (&Editor::presentation_info_changed, this, _1), gui_context());
+
        _route_groups = new EditorRouteGroups (this);
        _routes = new EditorRoutes (this);
        _regions = new EditorRegions (this);
        _snapshots = new EditorSnapshots (this);
        _locations = new EditorLocations (this);
-       _time_info_box = new TimeInfoBox (true);
+       _time_info_box = new TimeInfoBox ("EditorTimeInfo", true);
 
        /* these are static location signals */
 
@@ -670,42 +678,29 @@ Editor::Editor ()
        /* Pick up some settings we need to cache, early */
 
        XMLNode* settings = ARDOUR_UI::instance()->editor_settings();
-       XMLProperty* prop;
 
-       if (settings && (prop = settings->property ("notebook-shrunk"))) {
-               _notebook_shrunk = string_is_affirmative (prop->value ());
+       if (settings) {
+               settings->get_property ("notebook-shrunk", _notebook_shrunk);
        }
 
        editor_summary_pane.set_check_divider_position (true);
        editor_summary_pane.add (edit_packer);
 
-       Button* summary_arrows_left_left = manage (new Button);
-       summary_arrows_left_left->add (*manage (new Arrow (ARROW_LEFT, SHADOW_NONE)));
-       summary_arrows_left_left->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), LEFT)));
-       summary_arrows_left_left->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));
+       Button* summary_arrow_left = manage (new Button);
+       summary_arrow_left->add (*manage (new Arrow (ARROW_LEFT, SHADOW_NONE)));
+       summary_arrow_left->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), LEFT)));
+       summary_arrow_left->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));
 
-       Button* summary_arrows_left_right = manage (new Button);
-       summary_arrows_left_right->add (*manage (new Arrow (ARROW_RIGHT, SHADOW_NONE)));
-       summary_arrows_left_right->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), RIGHT)));
-       summary_arrows_left_right->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));
+       Button* summary_arrow_right = manage (new Button);
+       summary_arrow_right->add (*manage (new Arrow (ARROW_RIGHT, SHADOW_NONE)));
+       summary_arrow_right->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), RIGHT)));
+       summary_arrow_right->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));
 
        VBox* summary_arrows_left = manage (new VBox);
-       summary_arrows_left->pack_start (*summary_arrows_left_left);
-       summary_arrows_left->pack_start (*summary_arrows_left_right);
-
-       Button* summary_arrows_right_up = manage (new Button);
-       summary_arrows_right_up->add (*manage (new Arrow (ARROW_UP, SHADOW_NONE)));
-       summary_arrows_right_up->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), UP)));
-       summary_arrows_right_up->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));
-
-       Button* summary_arrows_right_down = manage (new Button);
-       summary_arrows_right_down->add (*manage (new Arrow (ARROW_DOWN, SHADOW_NONE)));
-       summary_arrows_right_down->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), DOWN)));
-       summary_arrows_right_down->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));
+       summary_arrows_left->pack_start (*summary_arrow_left);
 
        VBox* summary_arrows_right = manage (new VBox);
-       summary_arrows_right->pack_start (*summary_arrows_right_up);
-       summary_arrows_right->pack_start (*summary_arrows_right_down);
+       summary_arrows_right->pack_start (*summary_arrow_right);
 
        Frame* summary_frame = manage (new Frame);
        summary_frame->set_shadow_type (Gtk::SHADOW_ETCHED_IN);
@@ -734,32 +729,38 @@ Editor::Editor ()
        editor_summary_pane.set_drag_cursor (*_cursors->expand_up_down);
 
        float fract;
+       if (!settings || !settings->get_property ("edit-horizontal-pane-pos", fract) || fract > 1.0) {
+               /* initial allocation is 90% to canvas, 10% to notebook */
+               fract = 0.90;
+       }
+       edit_pane.set_divider (0, fract);
 
-       {
-               LocaleGuard lg;
-
-               if (!settings || ((prop = settings->property ("edit-horizontal-pane-pos")) == 0) || ((fract = atof (prop->value())) > 1.0)) {
-                       /* initial allocation is 90% to canvas, 10% to notebook */
-                       edit_pane.set_divider (0, 0.90);
-               } else {
-                       edit_pane.set_divider (0, fract);
-               }
-
-               if (!settings || ((prop = settings->property ("edit-vertical-pane-pos")) == 0) || ((fract = atof (prop->value())) > 1.0)) {
-                       /* initial allocation is 90% to canvas, 10% to summary */
-                       editor_summary_pane.set_divider (0, 0.90);
-               } else {
-
-                       editor_summary_pane.set_divider (0, fract);
-               }
+       if (!settings || !settings->get_property ("edit-vertical-pane-pos", fract) || fract > 1.0) {
+               /* initial allocation is 90% to canvas, 10% to summary */
+               fract = 0.90;
        }
+       editor_summary_pane.set_divider (0, fract);
 
        global_vpacker.set_spacing (2);
        global_vpacker.set_border_width (0);
 
-       global_vpacker.pack_start (toolbar_hbox, false, false);
-       global_vpacker.pack_start (edit_pane, true, true);
-       global_hpacker.pack_start (global_vpacker, true, true);
+       //the next three EventBoxes provide the ability for their child widgets to have a background color.  That is all.
+
+       Gtk::EventBox* ebox = manage (new Gtk::EventBox);  //a themeable box
+       ebox->set_name("EditorWindow");
+       ebox->add (toolbar_hbox);
+
+       Gtk::EventBox* epane_box = manage (new EventBoxExt);  //a themeable box
+       epane_box->set_name("EditorWindow");
+       epane_box->add (edit_pane);
+
+       Gtk::EventBox* epane_box2 = manage (new EventBoxExt);  //a themeable box
+       epane_box2->set_name("EditorWindow");
+       epane_box2->add (global_vpacker);
+
+       global_vpacker.pack_start (*ebox, false, false);
+       global_vpacker.pack_start (*epane_box, true, true);
+       global_hpacker.pack_start (*epane_box2, true, true);
 
        /* need to show the "contents" widget so that notebook will show if tab is switched to
         */
@@ -834,16 +835,16 @@ Editor::Editor ()
 
        _show_marker_lines = false;
 
-        /* Button bindings */
+       /* Button bindings */
 
        button_bindings = new Bindings ("editor-mouse");
 
        XMLNode* node = button_settings();
-        if (node) {
-                for (XMLNodeList::const_iterator i = node->children().begin(); i != node->children().end(); ++i) {
-                        button_bindings->load_operation (**i);
-                }
-        }
+       if (node) {
+               for (XMLNodeList::const_iterator i = node->children().begin(); i != node->children().end(); ++i) {
+                       button_bindings->load_operation (**i);
+               }
+       }
 
        constructed = true;
 
@@ -853,9 +854,6 @@ Editor::Editor ()
 
        setup_fade_images ();
 
-       LuaInstance::instance(); // instantiate
-       LuaInstance::instance()->ActionChanged.connect (sigc::mem_fun (*this, &Editor::set_script_action_name));
-
        instant_save ();
 }
 
@@ -876,10 +874,21 @@ Editor::~Editor()
        delete _locations;
        delete _playlist_selector;
        delete _time_info_box;
+       delete selection;
+       delete cut_buffer;
+       delete _cursors;
+
+       LuaInstance::destroy_instance ();
 
        for (list<XMLNode *>::iterator i = selection_op_history.begin(); i != selection_op_history.end(); ++i) {
                delete *i;
        }
+       for (std::map<ARDOUR::FadeShape, Gtk::Image*>::const_iterator i = _xfade_in_images.begin(); i != _xfade_in_images.end (); ++i) {
+               delete i->second;
+       }
+       for (std::map<ARDOUR::FadeShape, Gtk::Image*>::const_iterator i = _xfade_out_images.begin(); i != _xfade_out_images.end (); ++i) {
+               delete i->second;
+       }
 }
 
 XMLNode*
@@ -1017,7 +1026,7 @@ Editor::control_unselect ()
 void
 Editor::control_select (boost::shared_ptr<Stripable> s, Selection::Operation op)
 {
-       TimeAxisView* tav = axis_view_from_stripable (s);
+       TimeAxisView* tav = time_axis_view_from_stripable (s);
 
        if (tav) {
                switch (op) {
@@ -1123,7 +1132,7 @@ Editor::deferred_control_scroll (framepos_t /*target*/)
 }
 
 void
-Editor::access_action (std::string action_group, std::string action_item)
+Editor::access_action (const std::string& action_group, const std::string& action_item)
 {
        if (!_session) {
                return;
@@ -1139,6 +1148,12 @@ Editor::access_action (std::string action_group, std::string action_item)
        }
 }
 
+void
+Editor::set_toggleaction (const std::string& action_group, const std::string& action_item, bool s)
+{
+       ActionManager::set_toggleaction_state (action_group.c_str(), action_item.c_str(), s);
+}
+
 void
 Editor::on_realize ()
 {
@@ -1304,6 +1319,10 @@ Editor::set_session (Session *t)
                return;
        }
 
+       //initialize leftmost_frame to the extents of the session
+       //this prevents a bogus setting of leftmost = "0" if the summary view asks for the leftmost frame before the visible state has been loaded from instant.xml
+       leftmost_frame = session_gui_extents().first;
+       
        _playlist_selector->set_session (_session);
        nudge_clock->set_session (_session);
        _summary->set_session (_session);
@@ -1350,6 +1369,12 @@ Editor::set_session (Session *t)
        XMLNode* node = ARDOUR_UI::instance()->editor_settings();
        set_state (*node, Stateful::loading_state_version);
 
+       /* catch up on selection state, etc. */
+
+       PropertyChange sc;
+       sc.add (Properties::selected);
+       presentation_info_changed (sc);
+
        /* catch up with the playhead */
 
        _session->request_locate (playhead_cursor->current_frame ());
@@ -1365,12 +1390,13 @@ Editor::set_session (Session *t)
 
        _session->StepEditStatusChange.connect (_session_connections, invalidator (*this), boost::bind (&Editor::step_edit_status_change, this, _1), gui_context());
        _session->TransportStateChange.connect (_session_connections, invalidator (*this), boost::bind (&Editor::map_transport_state, this), gui_context());
+       _session->TransportLooped.connect (_session_connections, invalidator (*this), boost::bind (&Editor::transport_looped, this), gui_context());
        _session->PositionChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::map_position_change, this, _1), gui_context());
        _session->vca_manager().VCAAdded.connect (_session_connections, invalidator (*this), boost::bind (&Editor::add_vcas, this, _1), gui_context());
        _session->RouteAdded.connect (_session_connections, invalidator (*this), boost::bind (&Editor::add_routes, this, _1), gui_context());
        _session->DirtyChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::update_title, this), gui_context());
        _session->tempo_map().PropertyChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::tempo_map_changed, this, _1), gui_context());
-       _session->tempo_map().MetricPositionChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::marker_position_changed, this), gui_context());
+       _session->tempo_map().MetricPositionChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::tempometric_position_changed, this, _1), gui_context());
        _session->Located.connect (_session_connections, invalidator (*this), boost::bind (&Editor::located, this), gui_context());
        _session->config.ParameterChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::parameter_changed, this, _1), gui_context());
        _session->StateSaved.connect (_session_connections, invalidator (*this), boost::bind (&Editor::session_state_saved, this, _1), gui_context());
@@ -1409,53 +1435,15 @@ Editor::set_session (Session *t)
                break;
        }
 
-       /* catch up on selection of stripables (other selection state is lost
-        * when a session is closed
-        */
-
-       StripableList sl;
-       TrackViewList tl;
-       _session->get_stripables (sl);
-       for (StripableList::const_iterator s = sl.begin(); s != sl.end(); ++s) {
-               if ((*s)->presentation_info().selected()) {
-                       RouteTimeAxisView* rtav = get_route_view_by_route_id ((*s)->id());
-                       if (rtav) {
-                               tl.push_back (rtav);
-                       }
-               }
-       }
-       if (!tl.empty()) {
-               selection->set (tl);
-       }
-
        /* register for undo history */
        _session->register_with_memento_command_factory(id(), this);
        _session->register_with_memento_command_factory(_selection_memento->id(), _selection_memento);
 
-       ActionManager::ui_manager->signal_pre_activate().connect (sigc::mem_fun (*this, &Editor::action_pre_activated));
-
        LuaInstance::instance()->set_session(_session);
 
        start_updating_meters ();
 }
 
-void
-Editor::action_pre_activated (Glib::RefPtr<Action> const & a)
-{
-       if (a->get_name() == "RegionMenu") {
-               /* When the main menu's region menu is opened, we setup the actions so that they look right
-                  in the menu.  I can't find a way of getting a signal when this menu is subsequently closed,
-                  so we resensitize all region actions when the entered regionview or the region selection
-                  changes.  HOWEVER we can't always resensitize on entered_regionview change because that
-                  happens after the region context menu is opened.  So we set a flag here, too.
-
-                  What a carry on :(
-               */
-               sensitize_the_right_region_actions ();
-               _last_region_menu_was_main = true;
-       }
-}
-
 void
 Editor::fill_xfade_menu (Menu_Helpers::MenuList& items, bool start)
 {
@@ -1683,7 +1671,7 @@ Editor::popup_track_context_menu (int button, int32_t time, ItemType item_type,
        /* When the region menu is opened, we setup the actions so that they look right
           in the menu.
        */
-       sensitize_the_right_region_actions ();
+       sensitize_the_right_region_actions (false);
        _last_region_menu_was_main = false;
 
        menu->signal_hide().connect (sigc::bind (sigc::mem_fun (*this, &Editor::sensitize_all_region_actions), true));
@@ -1900,27 +1888,17 @@ Editor::add_region_context_items (Menu_Helpers::MenuList& edit_items, boost::sha
 
        RegionSelection rs = get_regions_from_selection_and_entered ();
 
-       string::size_type pos = 0;
        string menu_item_name = (rs.size() == 1) ? rs.front()->region()->name() : _("Selected Regions");
 
-       /* we have to hack up the region name because "_" has a special
-          meaning for menu titles.
-       */
-
-       while ((pos = menu_item_name.find ("_", pos)) != string::npos) {
-               menu_item_name.replace (pos, 1, "__");
-               pos += 2;
-       }
-
        if (_popup_region_menu_item == 0) {
-               _popup_region_menu_item = new MenuItem (menu_item_name);
+               _popup_region_menu_item = new MenuItem (menu_item_name, false);
                _popup_region_menu_item->set_submenu (*dynamic_cast<Menu*> (ActionManager::get_widget (X_("/PopupRegionMenu"))));
                _popup_region_menu_item->show ();
        } else {
                _popup_region_menu_item->set_label (menu_item_name);
        }
 
-       /* No latering allowed in later is higher layering model */
+       /* No layering allowed in later is higher layering model */
        RefPtr<Action> act = ActionManager::get_action (X_("EditorMenu"), X_("RegionMenuLayering"));
        if (act && Config->get_layer_model() == LaterHigher) {
                act->set_sensitive (false);
@@ -2331,6 +2309,7 @@ Editor::set_edit_point_preference (EditPoint ep, bool force)
        }
 
        reset_canvas_action_sensitivity (in_track_canvas);
+       sensitize_the_right_region_actions (false);
 
        instant_save ();
 }
@@ -2338,18 +2317,16 @@ Editor::set_edit_point_preference (EditPoint ep, bool force)
 int
 Editor::set_state (const XMLNode& node, int version)
 {
-       XMLProperty const * prop;
        set_id (node);
        PBD::Unwinder<bool> nsi (no_save_instant, true);
-       LocaleGuard lg;
+       bool yn;
 
        Tabbable::set_state (node, version);
 
-       if (_session && (prop = node.property ("playhead"))) {
-               framepos_t pos;
-               sscanf (prop->value().c_str(), "%" PRIi64, &pos);
-               if (pos >= 0) {
-                       playhead_cursor->set_position (pos);
+       framepos_t ph_pos;
+       if (_session && node.get_property ("playhead", ph_pos)) {
+               if (ph_pos >= 0) {
+                       playhead_cursor->set_position (ph_pos);
                } else {
                        warning << _("Playhead position stored with a negative value - ignored (use zero instead)") << endmsg;
                        playhead_cursor->set_position (0);
@@ -2358,86 +2335,70 @@ Editor::set_state (const XMLNode& node, int version)
                playhead_cursor->set_position (0);
        }
 
-       if ((prop = node.property ("mixer-width"))) {
-               editor_mixer_strip_width = Width (string_2_enum (prop->value(), editor_mixer_strip_width));
-       }
+       node.get_property ("mixer-width", editor_mixer_strip_width);
 
-       if ((prop = node.property ("zoom-focus"))) {
-               zoom_focus_selection_done ((ZoomFocus) string_2_enum (prop->value(), zoom_focus));
-       } else {
-               zoom_focus_selection_done (zoom_focus);
-       }
+       node.get_property ("zoom-focus", zoom_focus);
+       zoom_focus_selection_done (zoom_focus);
 
-       if ((prop = node.property ("zoom"))) {
+       double z;
+       if (node.get_property ("zoom", z)) {
                /* older versions of ardour used floating point samples_per_pixel */
-               double f = PBD::atof (prop->value());
-               reset_zoom (llrintf (f));
+               reset_zoom (llrintf (z));
        } else {
                reset_zoom (samples_per_pixel);
        }
 
-       if ((prop = node.property ("visible-track-count"))) {
-               set_visible_track_count (PBD::atoi (prop->value()));
+       int32_t cnt;
+       if (node.get_property ("visible-track-count", cnt)) {
+               set_visible_track_count (cnt);
        }
 
-       if ((prop = node.property ("snap-to"))) {
-               snap_type_selection_done ((SnapType) string_2_enum (prop->value(), _snap_type));
-               set_snap_to ((SnapType) string_2_enum (prop->value(), _snap_type));
-       } else {
-               set_snap_to (_snap_type);
+       SnapType snap_type;
+       if (!node.get_property ("snap-to", snap_type)) {
+               snap_type = _snap_type;
        }
+       set_snap_to (snap_type);
 
-       if ((prop = node.property ("snap-mode"))) {
-               snap_mode_selection_done((SnapMode) string_2_enum (prop->value(), _snap_mode));
+       SnapMode sm;
+       if (node.get_property ("snap-mode", sm)) {
+               snap_mode_selection_done(sm);
                /* set text of Dropdown. in case _snap_mode == SnapOff (default)
                 * snap_mode_selection_done() will only mark an already active item as active
                 * which does not trigger set_text().
                 */
-               set_snap_mode ((SnapMode) string_2_enum (prop->value(), _snap_mode));
+               set_snap_mode (sm);
        } else {
                set_snap_mode (_snap_mode);
        }
 
-       if ((prop = node.property ("internal-snap-to"))) {
-               internal_snap_type = (SnapType) string_2_enum (prop->value(), internal_snap_type);
-       }
-
-       if ((prop = node.property ("internal-snap-mode"))) {
-               internal_snap_mode = (SnapMode) string_2_enum (prop->value(), internal_snap_mode);
-       }
-
-       if ((prop = node.property ("pre-internal-snap-to"))) {
-               pre_internal_snap_type = (SnapType) string_2_enum (prop->value(), pre_internal_snap_type);
-       }
-
-       if ((prop = node.property ("pre-internal-snap-mode"))) {
-               pre_internal_snap_mode = (SnapMode) string_2_enum (prop->value(), pre_internal_snap_mode);
-       }
+       node.get_property ("internal-snap-to", internal_snap_type);
+       node.get_property ("internal-snap-mode", internal_snap_mode);
+       node.get_property ("pre-internal-snap-to", pre_internal_snap_type);
+       node.get_property ("pre-internal-snap-mode", pre_internal_snap_mode);
 
-       if ((prop = node.property ("mouse-mode"))) {
-               MouseMode m = str2mousemode(prop->value());
+       std::string mm_str;
+       if (node.get_property ("mouse-mode", mm_str)) {
+               MouseMode m = str2mousemode(mm_str);
                set_mouse_mode (m, true);
        } else {
                set_mouse_mode (MouseObject, true);
        }
 
-       if ((prop = node.property ("left-frame")) != 0) {
-               framepos_t pos;
-               if (sscanf (prop->value().c_str(), "%" PRId64, &pos) == 1) {
-                       if (pos < 0) {
-                               pos = 0;
-                       }
-                       reset_x_origin (pos);
+       framepos_t lf_pos;
+       if (node.get_property ("left-frame", lf_pos)) {
+               if (lf_pos < 0) {
+                       lf_pos = 0;
                }
+               reset_x_origin (lf_pos);
        }
 
-       if ((prop = node.property ("y-origin")) != 0) {
-               reset_y_origin (atof (prop->value ()));
+       double y_origin;
+       if (node.get_property ("y-origin", y_origin)) {
+               reset_y_origin (y_origin);
        }
 
-       if ((prop = node.property ("join-object-range"))) {
+       if (node.get_property ("join-object-range", yn)) {
                RefPtr<Action> act = ActionManager::get_action (X_("MouseMode"), X_("set-mouse-mode-object-range"));
-               bool yn = string_is_affirmative (prop->value());
                if (act) {
                        RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
                        tact->set_active (!yn);
@@ -2446,39 +2407,34 @@ Editor::set_state (const XMLNode& node, int version)
                set_mouse_mode(mouse_mode, true);
        }
 
-       if ((prop = node.property ("edit-point"))) {
-               set_edit_point_preference ((EditPoint) string_2_enum (prop->value(), _edit_point), true);
+       EditPoint ep;
+       if (node.get_property ("edit-point", ep)) {
+               set_edit_point_preference (ep, true);
        } else {
                set_edit_point_preference (_edit_point);
        }
 
-       if ((prop = node.property ("show-measures"))) {
-               bool yn = string_is_affirmative (prop->value());
-               _show_measures = yn;
-       }
+       node.get_property ("show-measures", _show_measures);
 
-       if ((prop = node.property ("follow-playhead"))) {
-               bool yn = string_is_affirmative (prop->value());
+       if (node.get_property ("follow-playhead", yn)) {
                set_follow_playhead (yn);
        }
 
-       if ((prop = node.property ("stationary-playhead"))) {
-               bool yn = string_is_affirmative (prop->value());
+       if (node.get_property ("stationary-playhead", yn)) {
                set_stationary_playhead (yn);
        }
 
-       if ((prop = node.property ("region-list-sort-type"))) {
-               RegionListSortType st;
-               _regions->reset_sort_type ((RegionListSortType) string_2_enum (prop->value(), st), true);
+       RegionListSortType sort_type;
+       if (node.get_property ("region-list-sort-type", sort_type)) {
+               _regions->reset_sort_type (sort_type, true);
        }
 
-       if ((prop = node.property ("show-editor-mixer"))) {
+       if (node.get_property ("show-editor-mixer", yn)) {
 
                Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-editor-mixer"));
                assert (act);
 
                Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
-               bool yn = string_is_affirmative (prop->value());
 
                /* do it twice to force the change */
 
@@ -2486,13 +2442,12 @@ Editor::set_state (const XMLNode& node, int version)
                tact->set_active (yn);
        }
 
-       if ((prop = node.property ("show-editor-list"))) {
+       if (node.get_property ("show-editor-list", yn)) {
 
                Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-editor-list"));
                assert (act);
 
                Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
-               bool yn = string_is_affirmative (prop->value());
 
                /* do it twice to force the change */
 
@@ -2500,15 +2455,15 @@ Editor::set_state (const XMLNode& node, int version)
                tact->set_active (yn);
        }
 
-       if ((prop = node.property (X_("editor-list-page")))) {
-               _the_notebook.set_current_page (atoi (prop->value ()));
+       int32_t el_page;
+       if (node.get_property (X_("editor-list-page"), el_page)) {
+               _the_notebook.set_current_page (el_page);
        }
 
-       if ((prop = node.property (X_("show-marker-lines")))) {
+       if (node.get_property (X_("show-marker-lines"), yn)) {
                Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-marker-lines"));
                assert (act);
                Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic (act);
-               bool yn = string_is_affirmative (prop->value ());
 
                tact->set_active (!yn);
                tact->set_active (yn);
@@ -2518,10 +2473,10 @@ Editor::set_state (const XMLNode& node, int version)
        for (XMLNodeList::const_iterator i = children.begin(); i != children.end(); ++i) {
                selection->set_state (**i, Stateful::current_state_version);
                _regions->set_state (**i);
+               _locations->set_state (**i);
        }
 
-       if ((prop = node.property ("maximised"))) {
-               bool yn = string_is_affirmative (prop->value());
+       if (node.get_property ("maximised", yn)) {
                Glib::RefPtr<Action> act = ActionManager::get_action (X_("Common"), X_("ToggleMaximalEditor"));
                assert (act);
                Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
@@ -2531,10 +2486,9 @@ Editor::set_state (const XMLNode& node, int version)
                }
        }
 
-       if ((prop = node.property ("nudge-clock-value"))) {
-               framepos_t f;
-               sscanf (prop->value().c_str(), "%" PRId64, &f);
-               nudge_clock->set (f);
+       framepos_t nudge_clock_value;
+       if (node.get_property ("nudge-clock-value", nudge_clock_value)) {
+               nudge_clock->set (nudge_clock_value);
        } else {
                nudge_clock->set_mode (AudioClock::Timecode);
                nudge_clock->set (_session->frame_rate() * 5, true);
@@ -2546,7 +2500,6 @@ Editor::set_state (const XMLNode& node, int version)
                 * those that are linked to a private variable may need changing
                 */
                RefPtr<Action> act;
-               bool yn;
 
                act = ActionManager::get_action (X_("Editor"), X_("ToggleMeasureVisibility"));
                if (act) {
@@ -2583,82 +2536,71 @@ XMLNode&
 Editor::get_state ()
 {
        XMLNode* node = new XMLNode (X_("Editor"));
-       char buf[32];
-       LocaleGuard lg;
 
-       id().print (buf, sizeof (buf));
-       node->add_property ("id", buf);
+       node->set_property ("id", id().to_s ());
 
        node->add_child_nocopy (Tabbable::get_state());
 
-       snprintf(buf,sizeof(buf), "%f", edit_pane.get_divider ());
-       node->add_property("edit-horizontal-pane-pos", string(buf));
-       node->add_property("notebook-shrunk", _notebook_shrunk ? "1" : "0");
-       snprintf(buf,sizeof(buf), "%f", editor_summary_pane.get_divider());
-       node->add_property("edit-vertical-pane-pos", string(buf));
+       node->set_property("edit-horizontal-pane-pos", edit_pane.get_divider ());
+       node->set_property("notebook-shrunk", _notebook_shrunk);
+       node->set_property("edit-vertical-pane-pos", editor_summary_pane.get_divider());
 
        maybe_add_mixer_strip_width (*node);
 
-       node->add_property ("zoom-focus", enum_2_string (zoom_focus));
-
-       snprintf (buf, sizeof(buf), "%" PRId64, samples_per_pixel);
-       node->add_property ("zoom", buf);
-       node->add_property ("snap-to", enum_2_string (_snap_type));
-       node->add_property ("snap-mode", enum_2_string (_snap_mode));
-       node->add_property ("internal-snap-to", enum_2_string (internal_snap_type));
-       node->add_property ("internal-snap-mode", enum_2_string (internal_snap_mode));
-       node->add_property ("pre-internal-snap-to", enum_2_string (pre_internal_snap_type));
-       node->add_property ("pre-internal-snap-mode", enum_2_string (pre_internal_snap_mode));
-       node->add_property ("edit-point", enum_2_string (_edit_point));
-       snprintf (buf, sizeof(buf), "%d", _visible_track_count);
-       node->add_property ("visible-track-count", buf);
-
-       snprintf (buf, sizeof (buf), "%" PRIi64, playhead_cursor->current_frame ());
-       node->add_property ("playhead", buf);
-       snprintf (buf, sizeof (buf), "%" PRIi64, leftmost_frame);
-       node->add_property ("left-frame", buf);
-       snprintf (buf, sizeof (buf), "%f", vertical_adjustment.get_value ());
-       node->add_property ("y-origin", buf);
-
-       node->add_property ("show-measures", _show_measures ? "yes" : "no");
-       node->add_property ("maximised", _maximised ? "yes" : "no");
-       node->add_property ("follow-playhead", _follow_playhead ? "yes" : "no");
-       node->add_property ("stationary-playhead", _stationary_playhead ? "yes" : "no");
-       node->add_property ("region-list-sort-type", enum_2_string (_regions->sort_type ()));
-       node->add_property ("mouse-mode", enum2str(mouse_mode));
-       node->add_property ("join-object-range", smart_mode_action->get_active () ? "yes" : "no");
+       node->set_property ("zoom-focus", zoom_focus);
+
+       node->set_property ("zoom", samples_per_pixel);
+       node->set_property ("snap-to", _snap_type);
+       node->set_property ("snap-mode", _snap_mode);
+       node->set_property ("internal-snap-to", internal_snap_type);
+       node->set_property ("internal-snap-mode", internal_snap_mode);
+       node->set_property ("pre-internal-snap-to", pre_internal_snap_type);
+       node->set_property ("pre-internal-snap-mode", pre_internal_snap_mode);
+       node->set_property ("edit-point", _edit_point);
+       node->set_property ("visible-track-count", _visible_track_count);
+
+       node->set_property ("playhead", playhead_cursor->current_frame ());
+       node->set_property ("left-frame", leftmost_frame);
+       node->set_property ("y-origin", vertical_adjustment.get_value ());
+
+       node->set_property ("show-measures", _show_measures);
+       node->set_property ("maximised", _maximised);
+       node->set_property ("follow-playhead", _follow_playhead);
+       node->set_property ("stationary-playhead", _stationary_playhead);
+       node->set_property ("region-list-sort-type", _regions->sort_type ());
+       node->set_property ("mouse-mode", mouse_mode);
+       node->set_property ("join-object-range", smart_mode_action->get_active ());
 
        Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-editor-mixer"));
        if (act) {
                Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
-               node->add_property (X_("show-editor-mixer"), tact->get_active() ? "yes" : "no");
+               node->set_property (X_("show-editor-mixer"), tact->get_active());
        }
 
        act = ActionManager::get_action (X_("Editor"), X_("show-editor-list"));
        if (act) {
                Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
-               node->add_property (X_("show-editor-list"), tact->get_active() ? "yes" : "no");
+               node->set_property (X_("show-editor-list"), tact->get_active());
        }
 
-       snprintf (buf, sizeof (buf), "%d", _the_notebook.get_current_page ());
-       node->add_property (X_("editor-list-page"), buf);
+       node->set_property (X_("editor-list-page"), _the_notebook.get_current_page ());
 
-        if (button_bindings) {
-                XMLNode* bb = new XMLNode (X_("Buttons"));
-                button_bindings->save (*bb);
-                node->add_child_nocopy (*bb);
-        }
+       if (button_bindings) {
+               XMLNode* bb = new XMLNode (X_("Buttons"));
+               button_bindings->save (*bb);
+               node->add_child_nocopy (*bb);
+       }
 
-       node->add_property (X_("show-marker-lines"), _show_marker_lines ? "yes" : "no");
+       node->set_property (X_("show-marker-lines"), _show_marker_lines);
 
        node->add_child_nocopy (selection->get_state ());
        node->add_child_nocopy (_regions->get_state ());
 
-       snprintf (buf, sizeof (buf), "%" PRId64, nudge_clock->current_duration());
-       node->add_property ("nudge-clock-value", buf);
+       node->set_property ("nudge-clock-value", nudge_clock->current_duration());
 
        node->add_child_nocopy (LuaInstance::instance()->get_action_state());
        node->add_child_nocopy (LuaInstance::instance()->get_hook_state());
+       node->add_child_nocopy (_locations->get_state ());
 
        return *node;
 }
@@ -2700,7 +2642,7 @@ Editor::trackview_by_y_position (double y, bool trackview_relative_offset) const
  *  @param event Event to get current key modifier information from, or 0.
  */
 void
-Editor::snap_to_with_modifier (framepos_t& start, GdkEvent const * event, RoundMode direction, bool for_mark)
+Editor::snap_to_with_modifier (MusicFrame& start, GdkEvent const * event, RoundMode direction, bool for_mark)
 {
        if (!_session || !event) {
                return;
@@ -2709,6 +2651,8 @@ Editor::snap_to_with_modifier (framepos_t& start, GdkEvent const * event, RoundM
        if (ArdourKeyboard::indicates_snap (event->button.state)) {
                if (_snap_mode == SnapOff) {
                        snap_to_internal (start, direction, for_mark);
+               } else {
+                       start.set (start.frame, 0);
                }
        } else {
                if (_snap_mode != SnapOff) {
@@ -2716,14 +2660,17 @@ Editor::snap_to_with_modifier (framepos_t& start, GdkEvent const * event, RoundM
                } else if (ArdourKeyboard::indicates_snap_delta (event->button.state)) {
                        /* SnapOff, but we pressed the snap_delta modifier */
                        snap_to_internal (start, direction, for_mark);
+               } else {
+                       start.set (start.frame, 0);
                }
        }
 }
 
 void
-Editor::snap_to (framepos_t& start, RoundMode direction, bool for_mark, bool ensure_snap)
+Editor::snap_to (MusicFrame& start, RoundMode direction, bool for_mark, bool ensure_snap)
 {
        if (!_session || (_snap_mode == SnapOff && !ensure_snap)) {
+               start.set (start.frame, 0);
                return;
        }
 
@@ -2731,8 +2678,9 @@ Editor::snap_to (framepos_t& start, RoundMode direction, bool for_mark, bool ens
 }
 
 void
-Editor::timecode_snap_to_internal (framepos_t& start, RoundMode direction, bool /*for_mark*/)
+Editor::timecode_snap_to_internal (MusicFrame& pos, RoundMode direction, bool /*for_mark*/)
 {
+       framepos_t start = pos.frame;
        const framepos_t one_timecode_second = (framepos_t)(rint(_session->timecode_frames_per_second()) * _session->samples_per_timecode_frame());
        framepos_t one_timecode_minute = (framepos_t)(rint(_session->timecode_frames_per_second()) * _session->samples_per_timecode_frame() * 60);
 
@@ -2794,14 +2742,16 @@ Editor::timecode_snap_to_internal (framepos_t& start, RoundMode direction, bool
                fatal << "Editor::smpte_snap_to_internal() called with non-timecode snap type!" << endmsg;
                abort(); /*NOTREACHED*/
        }
+
+       pos.set (start, 0);
 }
 
 void
-Editor::snap_to_internal (framepos_t& start, RoundMode direction, bool for_mark, bool ensure_snap)
+Editor::snap_to_internal (MusicFrame& start, RoundMode direction, bool for_mark, bool ensure_snap)
 {
        const framepos_t one_second = _session->frame_rate();
        const framepos_t one_minute = _session->frame_rate() * 60;
-       framepos_t presnap = start;
+       framepos_t presnap = start.frame;
        framepos_t before;
        framepos_t after;
 
@@ -2813,95 +2763,104 @@ Editor::snap_to_internal (framepos_t& start, RoundMode direction, bool for_mark,
 
        case SnapToCDFrame:
                if ((direction == RoundUpMaybe || direction == RoundDownMaybe) &&
-                   start % (one_second/75) == 0) {
+                   start.frame % (one_second/75) == 0) {
                        /* start is already on a whole CD frame, do nothing */
-               } else if (((direction == 0) && (start % (one_second/75) > (one_second/75) / 2)) || (direction > 0)) {
-                       start = (framepos_t) ceil ((double) start / (one_second / 75)) * (one_second / 75);
+               } else if (((direction == 0) && (start.frame % (one_second/75) > (one_second/75) / 2)) || (direction > 0)) {
+                       start.frame = (framepos_t) ceil ((double) start.frame / (one_second / 75)) * (one_second / 75);
                } else {
-                       start = (framepos_t) floor ((double) start / (one_second / 75)) * (one_second / 75);
+                       start.frame = (framepos_t) floor ((double) start.frame / (one_second / 75)) * (one_second / 75);
                }
+
+               start.set (start.frame, 0);
+
                break;
 
        case SnapToSeconds:
                if ((direction == RoundUpMaybe || direction == RoundDownMaybe) &&
-                   start % one_second == 0) {
+                   start.frame % one_second == 0) {
                        /* start is already on a whole second, do nothing */
-               } else if (((direction == 0) && (start % one_second > one_second / 2)) || (direction > 0)) {
-                       start = (framepos_t) ceil ((double) start / one_second) * one_second;
+               } else if (((direction == 0) && (start.frame % one_second > one_second / 2)) || (direction > 0)) {
+                       start.frame = (framepos_t) ceil ((double) start.frame / one_second) * one_second;
                } else {
-                       start = (framepos_t) floor ((double) start / one_second) * one_second;
+                       start.frame = (framepos_t) floor ((double) start.frame / one_second) * one_second;
                }
+
+               start.set (start.frame, 0);
+
                break;
 
        case SnapToMinutes:
                if ((direction == RoundUpMaybe || direction == RoundDownMaybe) &&
-                   start % one_minute == 0) {
+                   start.frame % one_minute == 0) {
                        /* start is already on a whole minute, do nothing */
-               } else if (((direction == 0) && (start % one_minute > one_minute / 2)) || (direction > 0)) {
-                       start = (framepos_t) ceil ((double) start / one_minute) * one_minute;
+               } else if (((direction == 0) && (start.frame % one_minute > one_minute / 2)) || (direction > 0)) {
+                       start.frame = (framepos_t) ceil ((double) start.frame / one_minute) * one_minute;
                } else {
-                       start = (framepos_t) floor ((double) start / one_minute) * one_minute;
+                       start.frame = (framepos_t) floor ((double) start.frame / one_minute) * one_minute;
                }
+
+               start.set (start.frame, 0);
+
                break;
 
        case SnapToBar:
-               start = _session->tempo_map().round_to_bar (start, direction);
+               start = _session->tempo_map().round_to_bar (start.frame, direction);
                break;
 
        case SnapToBeat:
-               start = _session->tempo_map().round_to_beat (start, direction);
+               start = _session->tempo_map().round_to_beat (start.frame, direction);
                break;
 
        case SnapToBeatDiv128:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 128, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 128, direction);
                break;
        case SnapToBeatDiv64:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 64, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 64, direction);
                break;
        case SnapToBeatDiv32:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 32, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 32, direction);
                break;
        case SnapToBeatDiv28:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 28, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 28, direction);
                break;
        case SnapToBeatDiv24:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 24, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 24, direction);
                break;
        case SnapToBeatDiv20:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 20, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 20, direction);
                break;
        case SnapToBeatDiv16:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 16, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 16, direction);
                break;
        case SnapToBeatDiv14:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 14, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 14, direction);
                break;
        case SnapToBeatDiv12:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 12, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 12, direction);
                break;
        case SnapToBeatDiv10:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 10, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 10, direction);
                break;
        case SnapToBeatDiv8:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 8, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 8, direction);
                break;
        case SnapToBeatDiv7:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 7, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 7, direction);
                break;
        case SnapToBeatDiv6:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 6, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 6, direction);
                break;
        case SnapToBeatDiv5:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 5, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 5, direction);
                break;
        case SnapToBeatDiv4:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 4, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 4, direction);
                break;
        case SnapToBeatDiv3:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 3, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 3, direction);
                break;
        case SnapToBeatDiv2:
-               start = _session->tempo_map().round_to_quarter_note_subdivision (start, 2, direction);
+               start = _session->tempo_map().round_to_quarter_note_subdivision (start.frame, 2, direction);
                break;
 
        case SnapToMark:
@@ -2909,29 +2868,31 @@ Editor::snap_to_internal (framepos_t& start, RoundMode direction, bool for_mark,
                        return;
                }
 
-               _session->locations()->marks_either_side (start, before, after);
+               _session->locations()->marks_either_side (start.frame, before, after);
 
                if (before == max_framepos && after == max_framepos) {
                        /* No marks to snap to, so just don't snap */
                        return;
                } else if (before == max_framepos) {
-                       start = after;
+                       start.frame = after;
                } else if (after == max_framepos) {
-                       start = before;
+                       start.frame = before;
                } else if (before != max_framepos && after != max_framepos) {
                        if ((direction == RoundUpMaybe || direction == RoundUpAlways))
-                               start = after;
+                               start.frame = after;
                        else if ((direction == RoundDownMaybe || direction == RoundDownAlways))
-                               start = before;
+                               start.frame = before;
                        else if (direction ==  0 ) {
-                               if ((start - before) < (after - start)) {
-                                       start = before;
+                               if ((start.frame - before) < (after - start.frame)) {
+                                       start.frame = before;
                                } else {
-                                       start = after;
+                                       start.frame = after;
                                }
                        }
                }
 
+               start.set (start.frame, 0);
+
                break;
 
        case SnapToRegionStart:
@@ -2944,9 +2905,9 @@ Editor::snap_to_internal (framepos_t& start, RoundMode direction, bool for_mark,
                        vector<framepos_t>::iterator next = region_boundary_cache.end ();
 
                        if (direction > 0) {
-                               next = std::upper_bound (region_boundary_cache.begin(), region_boundary_cache.end(), start);
+                               next = std::upper_bound (region_boundary_cache.begin(), region_boundary_cache.end(), start.frame);
                        } else {
-                               next = std::lower_bound (region_boundary_cache.begin(), region_boundary_cache.end(), start);
+                               next = std::lower_bound (region_boundary_cache.begin(), region_boundary_cache.end(), start.frame);
                        }
 
                        if (next != region_boundary_cache.begin ()) {
@@ -2957,12 +2918,15 @@ Editor::snap_to_internal (framepos_t& start, RoundMode direction, bool for_mark,
                        framepos_t const p = (prev == region_boundary_cache.end()) ? region_boundary_cache.front () : *prev;
                        framepos_t const n = (next == region_boundary_cache.end()) ? region_boundary_cache.back () : *next;
 
-                       if (start > (p + n) / 2) {
-                               start = n;
+                       if (start.frame > (p + n) / 2) {
+                               start.frame = n;
                        } else {
-                               start = p;
+                               start.frame = p;
                        }
                }
+
+               start.set (start.frame, 0);
+
                break;
        }
 
@@ -2976,21 +2940,20 @@ Editor::snap_to_internal (framepos_t& start, RoundMode direction, bool for_mark,
                        return;
                }
 
-               if (presnap > start) {
-                       if (presnap > (start + pixel_to_sample(snap_threshold))) {
-                               start = presnap;
+               if (presnap > start.frame) {
+                       if (presnap > (start.frame + pixel_to_sample(snap_threshold))) {
+                               start.set (presnap, 0);
                        }
 
-               } else if (presnap < start) {
-                       if (presnap < (start - pixel_to_sample(snap_threshold))) {
-                               start = presnap;
+               } else if (presnap < start.frame) {
+                       if (presnap < (start.frame - pixel_to_sample(snap_threshold))) {
+                               start.set (presnap, 0);
                        }
                }
 
        default:
                /* handled at entry */
                return;
-
        }
 }
 
@@ -3420,6 +3383,15 @@ Editor::map_transport_state ()
        update_loop_range_view ();
 }
 
+void
+Editor::transport_looped ()
+{
+       /* reset Playhead position interpolation.
+        * see Editor::super_rapid_screen_update
+        */
+       _last_update_time = 0;
+}
+
 /* UNDO/REDO */
 
 void
@@ -3810,6 +3782,7 @@ Editor::build_track_count_menu ()
                zoom_preset_selector.AddMenuElem (MenuElem (_("Zoom to 8 hours"), sigc::bind (sigc::mem_fun(*this, &Editor::set_zoom_preset), 8 * 60 * 60 * 1000)));
                zoom_preset_selector.AddMenuElem (MenuElem (_("Zoom to 24 hours"), sigc::bind (sigc::mem_fun(*this, &Editor::set_zoom_preset), 24 * 60 * 60 * 1000)));
                zoom_preset_selector.AddMenuElem (MenuElem (_("Zoom to Session"), sigc::mem_fun(*this, &Editor::temporal_zoom_session)));
+               zoom_preset_selector.AddMenuElem (MenuElem (_("Zoom to Extents"), sigc::mem_fun(*this, &Editor::temporal_zoom_extents)));
                zoom_preset_selector.AddMenuElem (MenuElem (_("Zoom to Range/Region Selection"), sigc::bind (sigc::mem_fun(*this, &Editor::temporal_zoom_selection), Horizontal)));
        }
 }
@@ -3852,11 +3825,21 @@ Editor::set_visible_track_count (int32_t n)
                str = s.str();
        } else if (_visible_track_count == 0) {
                uint32_t n = 0;
-               for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+               for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
                        if ((*i)->marked_for_display()) {
                                ++n;
+                               TimeAxisView::Children cl ((*i)->get_child_list ());
+                               for (TimeAxisView::Children::const_iterator j = cl.begin(); j != cl.end(); ++j) {
+                                       if ((*j)->marked_for_display()) {
+                                               ++n;
+                                       }
+                               }
                        }
                }
+               if (n == 0) {
+                       visible_tracks_selector.set_text (X_("*"));
+                       return;
+               }
                h = trackviews_height() / n;
                str = _("All");
        } else {
@@ -4033,9 +4016,9 @@ Editor::get_paste_offset (framepos_t pos, unsigned paste_count, framecnt_t durat
        framecnt_t offset = paste_count * duration;
 
        /* snap offset so pos + offset is aligned to the grid */
-       framepos_t offset_pos = pos + offset;
+       MusicFrame offset_pos (pos + offset, 0);
        snap_to(offset_pos, RoundUpMaybe);
-       offset = offset_pos - pos;
+       offset = offset_pos.frame - pos;
 
        return offset;
 }
@@ -4528,9 +4511,13 @@ Editor::set_samples_per_pixel (framecnt_t spp)
        }
 
        samples_per_pixel = spp;
+}
 
+void
+Editor::on_samples_per_pixel_changed ()
+{
        if (tempo_lines) {
-               tempo_lines->tempo_map_changed();
+               tempo_lines->tempo_map_changed(_session->tempo_map().music_origin());
        }
 
        bool const showing_time_selection = selection->time.length() > 0;
@@ -4571,13 +4558,7 @@ Editor::playhead_cursor_sample () const
 void
 Editor::queue_visual_videotimeline_update ()
 {
-       /* TODO:
-        * pending_visual_change.add (VisualChange::VideoTimeline);
-        * or maybe even more specific: which videotimeline-image
-        * currently it calls update_video_timeline() to update
-        * _all outdated_ images on the video-timeline.
-        * see 'exposeimg()' in video_image_frame.cc
-        */
+       pending_visual_change.add (VisualChange::VideoTimeline);
        ensure_visual_change_idle_handler ();
 }
 
@@ -4597,9 +4578,25 @@ Editor::_idle_visual_changer (void* arg)
        return static_cast<Editor*>(arg)->idle_visual_changer ();
 }
 
+void
+Editor::pre_render ()
+{
+       visual_change_queued = false;
+
+       if (pending_visual_change.pending != 0) {
+               ensure_visual_change_idle_handler();
+       }
+}
+
 int
 Editor::idle_visual_changer ()
 {
+       pending_visual_change.idle_handler_id = -1;
+
+       if (pending_visual_change.pending == 0) {
+               return 0;
+       }
+
        /* set_horizontal_position() below (and maybe other calls) call
           gtk_main_iteration(), so it's possible that a signal will be handled
           half-way through this method.  If this signal wants an
@@ -4610,7 +4607,10 @@ Editor::idle_visual_changer ()
           the last one.
        */
 
-       pending_visual_change.idle_handler_id = -1;
+       if (visual_change_queued) {
+               return 0;
+       }
+
        pending_visual_change.being_handled = true;
 
        VisualChange vc = pending_visual_change;
@@ -4621,40 +4621,63 @@ Editor::idle_visual_changer ()
 
        pending_visual_change.being_handled = false;
 
+       visual_change_queued = true;
+
        return 0; /* this is always a one-shot call */
 }
 
 void
 Editor::visual_changer (const VisualChange& vc)
 {
-       double const last_time_origin = horizontal_position ();
-
+       /**
+        * Changed first so the correct horizontal canvas position is calculated in
+        * Editor::set_horizontal_position
+        */
        if (vc.pending & VisualChange::ZoomLevel) {
                set_samples_per_pixel (vc.samples_per_pixel);
-
-               compute_fixed_ruler_scale ();
-
-               compute_bbt_ruler_scale (vc.time_origin, pending_visual_change.time_origin + current_page_samples());
-               update_tempo_based_rulers ();
-
-               update_video_timeline();
        }
 
        if (vc.pending & VisualChange::TimeOrigin) {
-               set_horizontal_position (vc.time_origin / samples_per_pixel);
+               double new_time_origin = sample_to_pixel_unrounded (vc.time_origin);
+               set_horizontal_position (new_time_origin);
        }
 
        if (vc.pending & VisualChange::YOrigin) {
                vertical_adjustment.set_value (vc.y_origin);
        }
 
-       if (last_time_origin == horizontal_position ()) {
-               /* changed signal not emitted */
-               update_fixed_rulers ();
-               redisplay_tempo (true);
+       /**
+        * Now the canvas is in the final state before render the canvas items that
+        * support the Item::prepare_for_render interface can calculate the correct
+        * item to visible canvas intersection.
+        */
+       if (vc.pending & VisualChange::ZoomLevel) {
+               on_samples_per_pixel_changed ();
+
+               compute_fixed_ruler_scale ();
+
+               compute_bbt_ruler_scale (vc.time_origin, pending_visual_change.time_origin + current_page_samples());
+               update_tempo_based_rulers ();
        }
 
        if (!(vc.pending & VisualChange::ZoomLevel)) {
+               /**
+                * If the canvas is not being zoomed then the canvas items will not change
+                * and cause Item::prepare_for_render to be called so do it here manually.
+                *
+                * Not ideal, but I can't think of a better solution atm.
+                */
+               _track_canvas->prepare_for_render();
+       }
+
+       // If we are only scrolling vertically there is no need to update these
+       if (vc.pending != VisualChange::YOrigin) {
+               update_fixed_rulers ();
+               redisplay_tempo (true);
+
+               /* video frames & position need to be updated for zoom, horiz-scroll
+                * and (explicitly) VisualChange::VideoTimeline.
+                */
                update_video_timeline();
        }
 
@@ -4690,11 +4713,11 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
        if (from_outside_canvas && (ep == EditAtMouse)) {
                ep = EditAtPlayhead;
        } else if (from_context_menu && (ep == EditAtMouse)) {
-               return  canvas_event_sample (&context_click_event, 0, 0);
+               return canvas_event_sample (&context_click_event, 0, 0);
        }
 
        if (entered_marker) {
-                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use entered marker @ %1\n", entered_marker->position()));
+               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use entered marker @ %1\n", entered_marker->position()));
                return entered_marker->position();
        }
 
@@ -4706,14 +4729,16 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
                ep = EditAtPlayhead;
        }
 
+       MusicFrame snap_mf (0, 0);
+
        switch (ep) {
        case EditAtPlayhead:
-               if (_dragging_playhead) {
+               if (_dragging_playhead && _control_scroll_target) {
                        where = *_control_scroll_target;
                } else {
                        where = _session->audible_frame();
                }
-                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use playhead @ %1\n", where));
+               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use playhead @ %1\n", where));
                break;
 
        case EditAtSelectedMarker:
@@ -4726,7 +4751,7 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
                                } else {
                                        where = loc->end();
                                }
-                                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use selected marker @ %1\n", where));
+                               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use selected marker @ %1\n", where));
                                break;
                        }
                }
@@ -4738,8 +4763,10 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
                        /* XXX not right but what can we do ? */
                        return 0;
                }
-               snap_to (where);
-                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use mouse @ %1\n", where));
+               snap_mf.frame = where;
+               snap_to (snap_mf);
+               where = snap_mf.frame;
+               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use mouse @ %1\n", where));
                break;
        }
 
@@ -4888,7 +4915,7 @@ Editor::get_regions_after (RegionSelection& rs, framepos_t where, const TrackVie
  */
 
 RegionSelection
-Editor::get_regions_from_selection_and_edit_point ()
+Editor::get_regions_from_selection_and_edit_point (EditIgnoreOption ignore, bool from_context_menu, bool from_outside_canvas)
 {
        RegionSelection regions;
 
@@ -4905,7 +4932,7 @@ Editor::get_regions_from_selection_and_edit_point ()
                        /* no region selected or entered, but some selected tracks:
                         * act on all regions on the selected tracks at the edit point
                         */
-                       framepos_t const where = get_preferred_edit_position ();
+                       framepos_t const where = get_preferred_edit_position (ignore, from_context_menu, from_outside_canvas);
                        get_regions_at(regions, where, tracks);
                }
        }
@@ -5047,6 +5074,38 @@ Editor::get_regions_corresponding_to (boost::shared_ptr<Region> region, vector<R
        }
 }
 
+RegionView*
+Editor::regionview_from_region (boost::shared_ptr<Region> region) const
+{
+       for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
+               RouteTimeAxisView* tatv;
+               if ((tatv = dynamic_cast<RouteTimeAxisView*> (*i)) != 0) {
+                       if (!tatv->track()) {
+                               continue;
+                       }
+                       RegionView* marv = tatv->view()->find_view (region);
+                       if (marv) {
+                               return marv;
+                       }
+               }
+       }
+       return NULL;
+}
+
+RouteTimeAxisView*
+Editor::rtav_from_route (boost::shared_ptr<Route> route) const
+{
+       for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
+               RouteTimeAxisView* rtav;
+               if ((rtav = dynamic_cast<RouteTimeAxisView*> (*i)) != 0) {
+                       if (rtav->route() == route) {
+                               return rtav;
+                       }
+               }
+       }
+       return NULL;
+}
+
 void
 Editor::show_rhythm_ferret ()
 {
@@ -5078,6 +5137,17 @@ Editor::first_idle ()
                (*t)->first_idle();
        }
 
+       /* now that all regionviews should exist, setup region selection */
+
+       RegionSelection rs;
+
+       for (list<PBD::ID>::iterator pr = selection->regions.pending.begin (); pr != selection->regions.pending.end (); ++pr) {
+               /* this is cumulative: rs is NOT cleared each time */
+               get_regionviews_by_id (*pr, rs);
+       }
+
+       selection->set (rs);
+
        // first idle adds route children (automation tracks), so we need to redisplay here
        _routes->redisplay ();
 
@@ -5173,19 +5243,12 @@ Editor::located ()
 
        _pending_locate_request = false;
        _pending_initial_locate = false;
+       _last_update_time = 0;
 }
 
 void
 Editor::region_view_added (RegionView * rv)
 {
-       for (list<PBD::ID>::iterator pr = selection->regions.pending.begin (); pr != selection->regions.pending.end (); ++pr) {
-               if (rv->region ()->id () == (*pr)) {
-                       selection->add (rv);
-                       selection->regions.pending.erase (pr);
-                       break;
-               }
-       }
-
        MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (rv);
        if (mrv) {
                list<pair<PBD::ID const, list<Evoral::event_id_t> > >::iterator rnote;
@@ -5207,8 +5270,8 @@ Editor::region_view_removed ()
        _summary->set_background_dirty ();
 }
 
-TimeAxisView*
-Editor::axis_view_from_stripable (boost::shared_ptr<Stripable> s) const
+AxisView*
+Editor::axis_view_by_stripable (boost::shared_ptr<Stripable> s) const
 {
        for (TrackViewList::const_iterator j = track_views.begin (); j != track_views.end(); ++j) {
                if ((*j)->stripable() == s) {
@@ -5219,6 +5282,25 @@ Editor::axis_view_from_stripable (boost::shared_ptr<Stripable> s) const
        return 0;
 }
 
+AxisView*
+Editor::axis_view_by_control (boost::shared_ptr<AutomationControl> c) const
+{
+       for (TrackViewList::const_iterator j = track_views.begin (); j != track_views.end(); ++j) {
+               if ((*j)->control() == c) {
+                       return *j;
+               }
+
+               TimeAxisView::Children kids = (*j)->get_child_list ();
+
+               for (TimeAxisView::Children::iterator k = kids.begin(); k != kids.end(); ++k) {
+                       if ((*k)->control() == c) {
+                               return (*k).get();
+                       }
+               }
+       }
+
+       return 0;
+}
 
 TrackViewList
 Editor::axis_views_from_routes (boost::shared_ptr<RouteList> r) const
@@ -5226,7 +5308,7 @@ Editor::axis_views_from_routes (boost::shared_ptr<RouteList> r) const
        TrackViewList t;
 
        for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
-               TimeAxisView* tv = axis_view_from_stripable (*i);
+               TimeAxisView* tv = time_axis_view_from_stripable (*i);
                if (tv) {
                        t.push_back (tv);
                }
@@ -5285,7 +5367,7 @@ Editor::add_stripables (StripableList& sl)
        TrackViewList new_selection;
        bool from_scratch = (track_views.size() == 0);
 
-       sl.sort (StripablePresentationInfoSorter());
+       sl.sort (Stripable::Sorter());
 
        for (StripableList::iterator s = sl.begin(); s != sl.end(); ++s) {
 
@@ -5335,8 +5417,7 @@ Editor::add_stripables (StripableList& sl)
         */
 
        if (!from_scratch && !new_selection.empty()) {
-               selection->tracks.clear();
-               selection->add (new_selection);
+               selection->set (new_selection);
                begin_selection_op_history();
        }
 
@@ -5400,6 +5481,16 @@ Editor::timeaxisview_deleted (TimeAxisView *tv)
                        next_tv = (*i);
                }
 
+               // skip VCAs (cannot be selected, n/a in editor-mixer)
+               if (dynamic_cast<VCATimeAxisView*> (next_tv)) {
+                       /* VCAs are sorted last in line -- route_sorter.h, jump to top */
+                       next_tv = track_views.front();
+               }
+               if (dynamic_cast<VCATimeAxisView*> (next_tv)) {
+                       /* just in case: no master, only a VCA remains */
+                       next_tv = 0;
+               }
+
 
                if (next_tv) {
                        set_selected_mixer_strip (*next_tv);
@@ -5416,6 +5507,9 @@ Editor::timeaxisview_deleted (TimeAxisView *tv)
 void
 Editor::hide_track_in_display (TimeAxisView* tv, bool apply_to_selection)
 {
+       if (!tv) {
+               return;
+       }
        if (apply_to_selection) {
                for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ) {
 
@@ -5438,6 +5532,18 @@ Editor::hide_track_in_display (TimeAxisView* tv, bool apply_to_selection)
        }
 }
 
+void
+Editor::show_track_in_display (TimeAxisView* tv, bool move_into_view)
+{
+       if (!tv) {
+               return;
+       }
+       _routes->show_track_in_display (*tv);
+       if (move_into_view) {
+               ensure_time_axis_view_is_visible (*tv, false);
+       }
+}
+
 bool
 Editor::sync_track_view_list_and_routes ()
 {
@@ -5457,15 +5563,15 @@ Editor::foreach_time_axis_view (sigc::slot<void,TimeAxisView&> theslot)
        }
 }
 
-/** Find a RouteTimeAxisView by the ID of its route */
-RouteTimeAxisView*
-Editor::get_route_view_by_route_id (const PBD::ID& id) const
+/** Find a StripableTimeAxisView by the ID of its stripable */
+StripableTimeAxisView*
+Editor::get_stripable_time_axis_by_id (const PBD::ID& id) const
 {
-       RouteTimeAxisView* v;
+       StripableTimeAxisView* v;
 
        for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
-               if((v = dynamic_cast<RouteTimeAxisView*>(*i)) != 0) {
-                       if(v->route()->id() == id) {
+               if((v = dynamic_cast<StripableTimeAxisView*>(*i)) != 0) {
+                       if(v->stripable()->id() == id) {
                                return v;
                        }
                }
@@ -5690,8 +5796,6 @@ Editor::super_rapid_screen_update ()
 
        /* PLAYHEAD AND VIEWPORT */
 
-       framepos_t const frame = _session->audible_frame();
-
        /* There are a few reasons why we might not update the playhead / viewport stuff:
         *
         * 1.  we don't update things when there's a pending locate request, otherwise
@@ -5701,46 +5805,92 @@ Editor::super_rapid_screen_update ()
         * 2.  if we're not rolling, there's nothing to do here (locates are handled elsewhere).
         * 3.  if we're still at the same frame that we were last time, there's nothing to do.
         */
+       if (_pending_locate_request || !_session->transport_rolling ()) {
+               _last_update_time = 0;
+               return;
+       }
 
-       if (!_pending_locate_request && _session->transport_speed() != 0 && frame != last_update_frame) {
+       if (_dragging_playhead) {
+               _last_update_time = 0;
+               return;
+       }
 
-               last_update_frame = frame;
+       bool latent_locate = false;
+       framepos_t frame = _session->audible_frame (&latent_locate);
+       const int64_t now = g_get_monotonic_time ();
+       double err = 0;
 
-               if (!_dragging_playhead) {
-                       playhead_cursor->set_position (frame);
-               }
+       if (_session->exporting ()) {
+               /* freewheel/export may be faster or slower than transport_speed() / SR.
+                * Also exporting multiple ranges locates/jumps without a _pending_locate_request.
+                */
+               _last_update_time = 0;
+       }
 
-               if (!_stationary_playhead) {
+       if (_last_update_time > 0) {
+               /* interpolate and smoothen playhead position */
+               const double ds =  (now - _last_update_time) * _session->transport_speed() * _session->nominal_frame_rate () * 1e-6;
+               framepos_t guess = playhead_cursor->current_frame () + rint (ds);
+               err = frame - guess;
 
-                       if (!_dragging_playhead && _follow_playhead && _session->requested_return_frame() < 0 && !pending_visual_change.being_handled) {
-                               /* We only do this if we aren't already
-                                  handling a visual change (ie if
-                                  pending_visual_change.being_handled is
-                                  false) so that these requests don't stack
-                                  up there are too many of them to handle in
-                                  time.
-                               */
-                               reset_x_origin_to_follow_playhead ();
-                       }
+               guess += err * .12 + _err_screen_engine; // time-constant based on 25fps (super_rapid_screen_update)
+               _err_screen_engine += .0144 * (err - _err_screen_engine); // tc^2
 
-               } else {
+#if 0 // DEBUG
+               printf ("eng: %ld  gui:%ld (%+6.1f)  diff: %6.1f (err: %7.2f)\n",
+                               frame, guess, ds,
+                               err, _err_screen_engine);
+#endif
 
-                       if (!_dragging_playhead && _follow_playhead && _session->requested_return_frame() < 0 && !pending_visual_change.being_handled) {
-                               framepos_t const frame = playhead_cursor->current_frame ();
-                               double target = ((double)frame - (double)current_page_samples()/2.0);
-                               if (target <= 0.0) {
-                                       target = 0.0;
-                               }
-                               // compare to EditorCursor::set_position()
-                               double const old_pos = sample_to_pixel_unrounded (leftmost_frame);
-                               double const new_pos = sample_to_pixel_unrounded (target);
-                               if (rint (new_pos) != rint (old_pos)) {
-                                       reset_x_origin (pixel_to_sample (floor (new_pos)));
-                               }
-                       }
+               frame = guess;
+       } else {
+               _err_screen_engine = 0;
+       }
 
-               }
+       if (err > 8192 || latent_locate) {
+               // in case of x-runs or freewheeling
+               _last_update_time = 0;
+               frame = _session->audible_frame ();
+       } else {
+               _last_update_time = now;
+       }
 
+       if (playhead_cursor->current_frame () == frame) {
+               return;
+       }
+
+       playhead_cursor->set_position (frame);
+
+       if (_session->requested_return_frame() >= 0) {
+               _last_update_time = 0;
+               return;
+       }
+
+       if (!_follow_playhead || pending_visual_change.being_handled) {
+               /* We only do this if we aren't already
+                * handling a visual change (ie if
+                * pending_visual_change.being_handled is
+                * false) so that these requests don't stack
+                * up there are too many of them to handle in
+                * time.
+                */
+               return;
+       }
+
+       if (!_stationary_playhead) {
+               reset_x_origin_to_follow_playhead ();
+       } else {
+               framepos_t const frame = playhead_cursor->current_frame ();
+               double target = ((double)frame - (double)current_page_samples() / 2.0);
+               if (target <= 0.0) {
+                       target = 0.0;
+               }
+               // compare to EditorCursor::set_position()
+               double const old_pos = sample_to_pixel_unrounded (leftmost_frame);
+               double const new_pos = sample_to_pixel_unrounded (target);
+               if (rint (new_pos) != rint (old_pos)) {
+                       reset_x_origin (pixel_to_sample (new_pos));
+               }
        }
 }
 
@@ -5762,7 +5912,7 @@ Editor::session_going_away ()
        clicked_routeview = 0;
        entered_regionview = 0;
        entered_track = 0;
-       last_update_frame = 0;
+       _last_update_time = 0;
        _drags->abort ();
 
        playhead_cursor->hide ();
@@ -5802,6 +5952,9 @@ Editor::session_going_away ()
        hide_measures ();
        clear_marker_display ();
 
+       delete tempo_lines;
+       tempo_lines = 0;
+
        stop_step_editing ();
 
        if (own_window()) {
@@ -5823,24 +5976,6 @@ Editor::trigger_script (int i)
        LuaInstance::instance()-> call_action (i);
 }
 
-void
-Editor::set_script_action_name (int i, const std::string& n)
-{
-       string const a = string_compose (X_("script-action-%1"), i + 1);
-       Glib::RefPtr<Action> act = ActionManager::get_action(X_("Editor"), a.c_str());
-       assert (act);
-       if (n.empty ()) {
-               act->set_label (string_compose (_("Unset #%1"), i + 1));
-               act->set_tooltip (_("no action bound"));
-               act->set_sensitive (false);
-       } else {
-               act->set_label (n);
-               act->set_tooltip (n);
-               act->set_sensitive (true);
-       }
-       KeyEditor::UpdateBindings ();
-}
-
 void
 Editor::show_editor_list (bool yn)
 {
@@ -5894,18 +6029,6 @@ Editor::update_region_layering_order_editor ()
 void
 Editor::setup_fade_images ()
 {
-       _fade_in_images[FadeLinear] = new Gtk::Image (get_icon_path (X_("fadein-linear")));
-       _fade_in_images[FadeSymmetric] = new Gtk::Image (get_icon_path (X_("fadein-symmetric")));
-       _fade_in_images[FadeFast] = new Gtk::Image (get_icon_path (X_("fadein-fast-cut")));
-       _fade_in_images[FadeSlow] = new Gtk::Image (get_icon_path (X_("fadein-slow-cut")));
-       _fade_in_images[FadeConstantPower] = new Gtk::Image (get_icon_path (X_("fadein-constant-power")));
-
-       _fade_out_images[FadeLinear] = new Gtk::Image (get_icon_path (X_("fadeout-linear")));
-       _fade_out_images[FadeSymmetric] = new Gtk::Image (get_icon_path (X_("fadeout-symmetric")));
-       _fade_out_images[FadeFast] = new Gtk::Image (get_icon_path (X_("fadeout-fast-cut")));
-       _fade_out_images[FadeSlow] = new Gtk::Image (get_icon_path (X_("fadeout-slow-cut")));
-       _fade_out_images[FadeConstantPower] = new Gtk::Image (get_icon_path (X_("fadeout-constant-power")));
-
        _xfade_in_images[FadeLinear] = new Gtk::Image (get_icon_path (X_("fadein-linear")));
        _xfade_in_images[FadeSymmetric] = new Gtk::Image (get_icon_path (X_("fadein-symmetric")));
        _xfade_in_images[FadeFast] = new Gtk::Image (get_icon_path (X_("fadein-fast-cut")));