[pitivi] elements: Handle only left clicks on the keyframes line

[Thibault Saunier <tsaunier src gnome org>]

commit 0bc283cbed75307ae7830d7215daa4cf4e680c29
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue Feb 9 09:45:11 2016 +0100

    elements: Handle only left clicks on the keyframes line
    
    Right-click and middle-click are for seek and scroll.
    
    Fixes https://phabricator.freedesktop.org/T7316
    
    Reviewed-by: Thibault Saunier <tsaunier gnome org>
    Differential Revision: https://phabricator.freedesktop.org/D743

 pitivi/timeline/elements.py |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/timeline/elements.py b/pitivi/timeline/elements.py
index 63ed010..6e6c1f6 100644
--- a/pitivi/timeline/elements.py
+++ b/pitivi/timeline/elements.py
@@ -232,6 +232,9 @@ class KeyframeCurve(FigureCanvas, Loggable):
         return False
 
     def __mplButtonPressEventCb(self, event):
+        if event.button != 1:
+            return
+
         result = self.__keyframes.contains(event)
         if result[0]:
             self.__offset = self.__keyframes.get_offsets()[
@@ -319,6 +322,9 @@ class KeyframeCurve(FigureCanvas, Loggable):
             cursor)
 
     def __mplButtonReleaseEventCb(self, event):
+        if event.button != 1:
+            return
+
         if not self.__dragged and not self.__offset:
             if event.guiEvent.type == Gdk.EventType.BUTTON_RELEASE:
                 self.__maybeCreateKeyframe(event)