Fix problems with dragging route groups so that they are too small.

git-svn-id: svn://localhost/ardour2/branches/3.0@5240 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 17 insertions, 0 deletions

diff --git a/gtk2_ardour/group_tabs.cc b/gtk2_ardour/group_tabs.cc
index 60eed1c7cf..8f82e856a9 100644
--- a/gtk2_ardour/group_tabs.cc
+++ b/gtk2_ardour/group_tabs.cc
@@ -114,16 +114,33 @@ GroupTabs::on_motion_notify_event (GdkEventMotion* ev)
 	}
 
 	if (_drag_from) {
+		
 		double f = _dragging->from + p - _drag_last;
+		
 		if (f < _drag_limit) {
 			f = _drag_limit;
 		}
+
+		double const t = _dragging->to - _dragging->last_ui_size;
+		if (f > t) {
+			f = t;
+		}
+		
 		_dragging->from = f;
+		
 	} else {
+		
 		double t = _dragging->to + p - _drag_last;
+
 		if (t > _drag_limit) {
 			t = _drag_limit;
 		}
+
+		double const f = _dragging->from + _dragging->first_ui_size;
+		if (t < f) {
+			t = f;
+		}
+		
 		_dragging->to = t;
 	}