Check if the Gtk3 source is destroyed before removing

zeroSteiner · zeroSteiner · commit 5467c986bf79 · 2015-02-25T12:30:43.000-05:00
This adds a reference to the Gtk3 source created by
GLib.idle_add so it can be checked to see if it was
destroyed later to avoid removing an invalid source
id and causing warning messages to be displayed.
diff --git a/lib/matplotlib/backends/backend_gtk3.py b/lib/matplotlib/backends/backend_gtk3.py
@@ -208,11 +208,14 @@ def __init__(self, figure):
         self.set_can_focus(True)
         self._renderer_init()
         self._idle_event_id = GLib.idle_add(self.idle_event)
+        default_context = GLib.main_context_get_thread_default() or GLib.main_context_default()
+        self._idle_event_source = default_context.find_source_by_id(self._idle_event_id)
 
     def destroy(self):
         #Gtk.DrawingArea.destroy(self)
         self.close_event()
-        GLib.source_remove(self._idle_event_id)
+        if not self._idle_event_source.is_destroyed():
+            GLib.source_remove(self._idle_event_id)
         if self._idle_draw_id != 0:
             GLib.source_remove(self._idle_draw_id)
 
