bug#8147: 24.0.50; Inserting *Help* buffer can lead to data loss

[Stefan Monnier]

> I reported this problem to emacs-devel in May 2008 (see
> http://thread.gmane.org/gmane.emacs.devel/97367/) and there were a few
> ideas about how to deal with it, but none were pursued.  I just got bit
> by it again -- more fool me, perhaps, but it gives me the opportunity to
> put it in the bug tracker.  And I offer a fix to the immediate problem

Maybe another approach is for those buttons to check that the current
buffer is (derived-mode-p 'help-mode) before reusing it.


        Stefan