snapshot-47

Fix dialog crash

I found and subsequently patched a crashing bug a few days after uploading
snapshot 46 and since I have yet to update the AppCast I thought it worthwile
not to and simply build a new snapshot with the patch included.

The bug patch is not new, in fact it has probably been with us in one form or
another since I implemented GUI dialogs.  With snapshot 45 it is easy to
reproduce however (DON'T TRY THIS AT HOME): enter some text, hit Cmd-w and
choose Save, enter a file name and save...MacVim crashes.

The only difference between snapshot 46 and 47 (apart from a change to some log
messages) is the inclusion of this patch and an update to the latest Vim
patches and runtime files.