[pitivi] timeline: Make sure insertToEnd works with any type of TimelineObject

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

commit 3fdf75d7c1cbfec1d341504cbe6945405ab134b5
Author: Matas Brazdeikis <matas brazdeikis lt>
Date:   Tue Aug 14 09:28:30 2012 +0100

    timeline: Make sure insertToEnd works with any type of TimelineObject
    
    Only FileSource TrackObjects are added async...

 pitivi/timeline/timeline.py |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index 25ebe5d..02e3d87 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -1890,15 +1890,14 @@ class Timeline(gtk.Table, Loggable, Zoomable):
 
             # Update zoom level if needed
             return
-
         source = self._sources_to_insert.pop()
         layer = timeline.get_layers()[0]  # FIXME Get the longest layer
-        layer.add_object(source)
-
         # Waiting for the TrackObject to be created because of a race
         # condition, and to know the real length of the timeline when
         # adding several sources at a time.
+        # connecting before adding, as it signaled before connection
         source.connect("track-object-added", self._trackObjectAddedCb)
+        layer.add_object(source)
 
     def _trackObjectAddedCb(self, source, trackobj):
         """ After an object has been added to the first track, position it
@@ -1907,7 +1906,7 @@ class Timeline(gtk.Table, Loggable, Zoomable):
         layer = timeline.get_layers()[0]  # FIXME Get the longest layer
 
         # Set the duration of the clip if it is an image
-        if source.is_image():
+        if hasattr(source,"is_image") and source.is_image():
             source.set_duration(long(self._settings.imageClipLength) * gst.SECOND / 1000)
 
         # Handle the case where we just inserted the first clip