bug#15247: 24.3.50; Emacs Cygwin crashes when replying to a mail

[martin rudalics]

> I realized that this is caused by `make-frame-invisible' that runs
> when there is only one Emacs frame.  At least for Cygwin, you should
> be able to reproduce it in this way:
>
> emacs -Q --eval '(make-frame-invisible (selected-frame) t)'
>
> I also guess that it was harmless until about a week ago.

Should be harmless again with revision 114106.

> Why such an odd thing was run is because I was using this advice
> to make `raise-frame' work on Cygwin.
>
> (defadvice raise-frame (before make-it-work (&optional frame) activate)
>   "Make it work on Cygwin."
>   (make-frame-invisible frame t))
>
> As I wrote in <http://thread.gmane.org/gmane.emacs.devel/150533>,
> `raise-frame' doesn't raise iconified, invisible, or hidden frame.
> Now I changed it into:
>
> (defadvice raise-frame (before make-it-work (&optional frame) activate)
>   "Make it work on Cygwin."
>   (or (eq frame (selected-frame))
>       (make-frame-invisible frame)))

I don't understand fully: Above you say that "`raise-frame' doesn't
raise iconified, invisible, or hidden frame" and in the before-advice
or `raise-frame' you make the frame invisible?  

> Even if Emacs should not crash for any Lisp code,

It should not, indeed.

> it's a trivial
> one among many(?) issues concerning Cygwin.  So, I'm closing this
> bug.  Sorry for the noise.

martin