[meld] Add comments for future fixes

[Kai Willadsen <kaiw src gnome org>]

commit 3f44a3e8e033f67966396e7fcbf0ebe168fbeea4
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Wed Oct 3 06:53:49 2012 +1000

    Add comments for future fixes
    
    Comments taken from Stephan Hilb's comment in bug 683534.

 meld/filediff.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index ae1295c..0db8536 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -712,6 +712,8 @@ class FileDiff(melddoc.MeldDoc, gnomeglade.Component):
             self.refresh_comparison()
 
     def on_key_press_event(self, object, event):
+        # The correct way to handle these modifiers would be to use
+        # gdk_keymap_get_modifier_state method, available from GDK 3.4.
         keymap = gtk.gdk.keymap_get_default()
         x = self.keylookup.get(keymap.translate_keyboard_state(
                                event.hardware_keycode, 0, event.group)[0], 0)