--- a/Plugins/VcsPlugins/vcsMercurial/HgLogBrowserDialog.py	Tue Jun 18 19:13:58 2013 +0200
+++ b/Plugins/VcsPlugins/vcsMercurial/HgLogBrowserDialog.py	Fri Jun 21 19:09:04 2013 +0200
@@ -955,7 +955,7 @@
         """
         if self.diff is None:
             from .HgDiffDialog import HgDiffDialog
-            self.diff = HgDiffDialog(self.vcs)
+            self.diff = HgDiffDialog(self.vcs, self)
         self.diff.show()
         self.diff.start(self.filename, [rev1, rev2], self.bundle)