bug#69870: 29.2; Simple fix for Motif "XtGrabPointer failed."

[Po Lu]

"Sparapani, Rodney" <rsparapa@mcw.edu> writes:
> Usually, this will lock-up emacs and you have to kill it from
>
> the window manager which seems to be the only option available.
>
> When there are unsaved files, you still get a prompt for that

> so it is not a crash, but just very annoying.
>
> However, I realized that this bug/feature had already been
>
> addressed for LUCID scrollbars in lwlib/xlwmenu.c but that code
>
> is inactive for Motif.  So the simple solution is to uncomment 
>
> this block from lines 2906 to 2913 for Motif as well...
>
> //#ifdef emacs
>
>   if (x_had_errors_p (display))
>
>     {
>
>       pointer_grabbed = 0;
>
>       XtUngrabPointer ((Widget)mw, event->time);
>
>     }
>
>   x_uncatch_errors ();
>
> //#endif

The macro emacs is always defined, and this block of code relies on the
presence of an earlier call to x_catch_errors, which would not have been
satisified if this "#ifdef emacs" was inactive.  Therefore, something
else is at work here.