ensure non-zero midi region length when tempo map changes.

diff --git a/libs/ardour/midi_region.cc b/libs/ardour/midi_region.cc
index 869cb487e48eeb72c24e842f4ce4bb69adf4eb01..7f98f191f7c3e7604412a74aab4760baf73665e3 100644 (file)
--- a/libs/ardour/midi_region.cc
+++ b/libs/ardour/midi_region.cc
@@ -285,7 +285,7 @@ MidiRegion::update_after_tempo_map_change (bool /* send */)
        Region::update_after_tempo_map_change (false);
 
        /* _start has now been updated. */
-       _length = _session.tempo_map().frames_between_quarter_notes (pos_beats(), pos_beats() + _length_beats);
+       _length = max ((framecnt_t) 1, _session.tempo_map().frames_between_quarter_notes (pos_beats(), pos_beats() + _length_beats));
 
        if (old_start != _start) {
                s_and_l.add (Properties::start);