[meld] Fix pygtk 2.16 incompatiblity

[Kai Willadsen <kaiw src gnome org>]

commit 6119a1841ff7da9bec72f974860dfb0ab030db54
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Mar 2 05:45:52 2013 +1000

    Fix pygtk 2.16 incompatiblity

 meld/filediff.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index 2010e31..36220c1 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -1452,7 +1452,7 @@ class FileDiff(melddoc.MeldDoc, gnomeglade.Component):
         buf.data.writable = writable
         self.recompute_label()
         index = self.textbuffer.index(buf)
-        self.readonlytoggle[index].set_visible(not writable)
+        self.readonlytoggle[index].props.visible = not writable
         self.set_buffer_editable(buf, writable)
 
     def set_buffer_modified(self, buf, yesno):