Don't uncache the VC inventory

The memory savings here are very very minor anyway, and it was almost
always a loss, as we often then re-cache soon thereafter. Most
importantly, this exposed a bug in our SVN usage (or rather in the API
itself) where the first re-cache was done with a subdirectory and we
had a bad cache for the rest of the tree.

Author: kaiw

meld/vcview.py

@@ -561,7 +561,6 @@ def showable(entry):
             else:
                 # just the root
                 self.treeview.expand_row((0,), 0)
-        self.vc.uncache_inventory()
 
     def on_fileentry_activate(self, fileentry):
         path = fileentry.get_full_path()