[meld] dirdiff: Clear out message areas on refresh (bgo#752936)

[Kai Willadsen <kaiw src gnome org>]

commit 863b3479561a5e50016973851e90ca466dccac5d
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Aug 1 07:32:44 2015 +1000

    dirdiff: Clear out message areas on refresh (bgo#752936)

 meld/dirdiff.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meld/dirdiff.py b/meld/dirdiff.py
index 82eeed9..212dba7 100644
--- a/meld/dirdiff.py
+++ b/meld/dirdiff.py
@@ -627,6 +627,8 @@ class DirDiff(melddoc.MeldDoc, gnomeglade.Component):
         locations = [os.path.abspath(l) if l else '' for l in locations]
         self.current_path = None
         self.model.clear()
+        for m in self.msgarea_mgr:
+            m.clear()
         for pane, loc in enumerate(locations):
             if loc:
                 self.fileentry[pane].set_filename(loc)