Rename in WT browser launches default action incorrectly

[Ian Clatworthy]

As implemented, the Rename context menu action requires the User to press Enter to complete the new name. However, the tree widget also listens out for the Enter key and tries to run the default action when encountered. In qbrowse, this throws an error to the terminal, e.g.

ian@wallaby:~/Projects/scm-play/repo with spaces/trunk$ bzr qbrowse .
Error showing url: Error stating file '/home/ian/Projects/scm-play/repo with spaces/trunk/zz': No such file or directory

When embedded in Explorer, the outcome is more distracting: the (old) file is opened or edited.

Inside Explorer, I've tried keeping track of when the renaming action is active and ignoring calls to do_default_action() during that time. Unfortunately, that hack doesn't work because the keyEvent is processed after renaming thinks it is finished. It looks like this must be addressed in the QBzr layer (somehow).