[pitivi/ges: 72/287] timeline: Do not readd same file when trying to add a new one

[Jean-FranÃois Fortin Tam <jfft src gnome org>]

commit e4c14bf0c94f7ce0e43acc01ffca23ff1e56d361
Author: Thibault Saunier <thibault saunier collabora com>
Date:   Sun Nov 27 18:10:36 2011 -0300

    timeline: Do not readd same file when trying to add a new one

 pitivi/ui/timeline.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/ui/timeline.py b/pitivi/ui/timeline.py
index 0ab2b0d..ddd5e88 100644
--- a/pitivi/ui/timeline.py
+++ b/pitivi/ui/timeline.py
@@ -402,7 +402,7 @@ class Timeline(gtk.Table, Loggable, Zoomable):
 
     def _dragMotionCb(self, unused, context, x, y, timestamp):
 
-        if self._factories is None:
+        if not self._factories:
             if  context.targets in DND_EFFECT_LIST:
                 atom = gtk.gdk.atom_intern(dnd.EFFECT_TUPLE[0])
             else:
@@ -435,6 +435,7 @@ class Timeline(gtk.Table, Loggable, Zoomable):
             self._move_context.finish()
             self.app.action_log.commit()
             context.drop_finish(True, timestamp)
+            self._factories = []
 
             return True