Add decodefoldernames option to decode IMAP folder names using UTF-7.

Signed-off-by: Tommie Gannert <tommie@gannert.se>

offlineimap/folder/IMAP.py

@@ -258,6 +258,13 @@ class IMAPFolder(BaseFolder):
     def dropmessagelistcache(self):
         self.messagelist = {}
 
+    # Interface from BaseFolder
+    def getvisiblename(self):
+        vname = super(IMAPFolder, self).getvisiblename()
+        if self.repository.getdecodefoldernames():
+            return imaputil.decode_mailbox_name(vname)
+        return vname
+
     # Interface from BaseFolder
     def getmessagelist(self):
         return self.messagelist