bug#66978: 30.0.50; crashed when closing one of two frames

[Po Lu]

Gregor Zattler <grfz@gmx.de> writes:

> I did.  It evaluated to `nil'!?
>
> Then I was not able to reproduce the crash.  I now
> re-tried with my usual configuration (and also with an
> external monitor).  But no crash.
>
> The doc string of x-synchronize warns of it's
> performance penalty, but I do not experience one.
> Might it be that the return value of nil indicates it
> does not work at all in my case?

No, x-synchronize is always successful.

> I put this expression in my everyday Emacs
> configuration for now in the hope the problem will
> re-surface some time.

Thanks for sacrificing some performance for the commendable task of
debugging Emacs.