[pitivi] validate: Make sure to release the mouse when changing edition edge

[Thibault Saunier <tsaunier src gnome org>]

commit b5c1aa1571961798d0d3a9a60b635de730f37a0b
Author: Thibault Saunier <tsaunier gnome org>
Date:   Sat May 2 09:57:15 2015 +0200

    validate: Make sure to release the mouse when changing edition edge
    
    Otherwise the timeline will not know that we changed edge,
    and in practice you can not change edge without releasing
    the mouse.

 pitivi/utils/validate.py |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/pitivi/utils/validate.py b/pitivi/utils/validate.py
index 61ff5b5..4c65185 100644
--- a/pitivi/utils/validate.py
+++ b/pitivi/utils/validate.py
@@ -174,7 +174,14 @@ def _releaseButtonIfNeeded(scenario, action, timeline, container, edge, layer_pr
     except KeyError:
         return
 
-    if next_action is None or next_action.type != "edit-container":
+    need_release = True
+    if next_action and next_action.type == "edit-container":
+        edge = get_edge(next_action.structure)
+
+        if edge == scenario.last_edge:
+            need_release = False
+
+    if next_action is None or need_release:
         scenario.dragging = False
         event = Gdk.EventButton.new(Gdk.EventType.BUTTON_RELEASE)
         event.button = 1
@@ -289,7 +296,11 @@ def editContainer(scenario, action):
                 alloc = layer.ui.get_allocation()
                 y = alloc.y + alloc.height + 10 - container_ui.translate_coordinates(timeline.ui, 0, 0)[1]
 
-    if not hasattr(scenario, "dragging") or scenario.dragging is False:
+    if not hasattr(scenario, "last_edge"):
+        scenario.last_edge = edge
+
+    if not hasattr(scenario, "dragging") or scenario.dragging is False \
+            or scenario.last_edge != edge:
         if isinstance(container, GES.SourceClip):
             if edge == GES.Edge.EDGE_START:
                 container.ui.leftHandle._eventCb(container.ui.leftHandle, 
Gdk.Event.new(Gdk.EventType.ENTER_NOTIFY))
@@ -315,6 +326,7 @@ def editContainer(scenario, action):
 
     _releaseButtonIfNeeded(scenario, action, timeline, container, edge, layer_prio,
                            position, y)
+    scenario.last_edge = edge
 
     return 1