[pitivi] timeline: Avoid show_all for the entire timeline when a layer is added

[Thibault Saunier <tsaunier src gnome org>]

commit 275bd84eba9208d8686c24307955b8fa62373e91
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Oct 23 22:44:52 2015 +0200

    timeline: Avoid show_all for the entire timeline when a layer is added
    
    Differential Revision: https://phabricator.freedesktop.org/D512
    Reviewed-by: Thibault Saunier <tsaunier gnome org>

 pitivi/timeline/timeline.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index 6ada00a..9cdcb57 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -828,6 +828,7 @@ class Timeline(Gtk.EventBox, Zoomable, Loggable):
         layer.connect("remove-me", self._removeLayerCb)
 
         control = LayerControls(bLayer, self.app)
+        control.show_all()
         self.__layers_controls_vbox.pack_start(control, False, False, 0)
         bLayer.control_ui = control
         # Check the media types so the controls are set up properly.
@@ -837,12 +838,11 @@ class Timeline(Gtk.EventBox, Zoomable, Loggable):
         layer_widget.pack_start(layer.before_sep, False, False, 0)
         layer_widget.pack_start(layer, True, True, 0)
         layer_widget.pack_start(layer.after_sep, False, False, 0)
+        layer_widget.show_all()
         self.__layers_vbox.pack_start(layer_widget, True, True, 0)
 
         bLayer.connect("notify::priority", self.__layerPriorityChangedCb)
 
-        self.show_all()
-
     def _removeLayerCb(self, layer):
         self.bTimeline.remove_layer(layer.bLayer)