Update MidiRegion::_start_beats on trimming the front of a MIDI region; reset _start_beats with _start on MidiRegion::fix_negative_start(). May help with #4736.

git-svn-id: svn://localhost/ardour2/branches/3.0@11984 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 9 insertions, 3 deletions

diff --git a/libs/ardour/region.cc b/libs/ardour/region.cc
index 66c0b84ae9..99906665d7 100644
--- a/libs/ardour/region.cc
+++ b/libs/ardour/region.cc
@@ -686,7 +686,7 @@ Region::set_start (framepos_t pos)
 			return;
 		}
 
-		_start = pos;
+		set_start_internal (pos);
 		_whole_file = false;
 		first_edit ();
 		invalidate_transients ();
@@ -701,6 +701,7 @@ Region::trim_start (framepos_t new_position)
 	if (locked() || position_locked()) {
 		return;
 	}
+
 	framepos_t new_start;
 	frameoffset_t const start_shift = new_position - _position;
 
@@ -732,7 +733,7 @@ Region::trim_start (framepos_t new_position)
 		return;
 	}
 
-	_start = new_start;
+	set_start_internal (new_start);
 	_whole_file = false;
 	first_edit ();
 
@@ -888,7 +889,7 @@ Region::trim_to_internal (framepos_t position, framecnt_t length)
 	PropertyChange what_changed;
 
 	if (_start != new_start) {
-		_start = new_start;
+		set_start_internal (new_start);
 		what_changed.add (Properties::start);
 	}
 
@@ -1648,3 +1649,8 @@ Region::post_set (const PropertyChange& pc)
 	}
 }
 
+void
+Region::set_start_internal (framecnt_t s)
+{
+	_start = s;
+}