crashes. This should fix several of the mailnews bugs. It's hard to
say exactly which of them will be fixed by this, since some of them
are caused by memory whackage and others are real bugs in the widget
itself.
Also adding in support for Troy's primary frame hashtable, thus ensuring
that when the tree widget dynamically deletes frames that the mappings
in the hashtable are removed (so that deleted frames won't accidentally
be retrieved).
git-svn-id: svn://10.0.0.236/trunk@38926 18797224-902f-48f8-a5cc-f745e15eee43
c629e6ba46