Emit SelectionCleared() when unique-selecting the first

note in a region, so that other regions clear their
selections.


git-svn-id: svn://localhost/ardour2/branches/3.0@12472 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/midi_region_view.cc

@@ -1941,6 +1941,14 @@ MidiRegionView::clear_selection_except (ArdourCanvas::CanvasNoteEvent* ev, bool
 {
 	bool changed = false;
 
+	if (ev && !ev->selected ()) {
+		/* We're selecting this note, so the selection has changed; if
+		   there is nothing else currently selected, the loop below will
+		   not pick up on the change.
+		*/
+		changed = true;
+	}
+
 	for (Selection::iterator i = _selection.begin(); i != _selection.end(); ) {
 		if ((*i) != ev) {
 			Selection::iterator tmp = i;