+ /** Driven by a double-click, switch in or out of a mode in which
+ editing is primarily focused on "within" regions, rather than
+ regions as black-box objects. For Ardour3, this is aimed at editing
+ MIDI regions but may expand in the future to other types of
+ regions.
+ */
+
+ virtual bool toggle_internal_editing_from_double_click (GdkEvent*) = 0;
+