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

[Eli Zaretskii <eliz@gnu.org>]

Ping!  Can we please make some progress with this issue?

> From: "Sparapani, Rodney" <rsparapa@mcw.edu>
> CC: "69870@debbugs.gnu.org" <69870@debbugs.gnu.org>
> Date: Sun, 31 Mar 2024 15:31:38 +0000
> 
> We run emacs on a Linux server and display it on Macs and PCs
> with X-windows.  We have about 30 users but not everyone is
> using emacs all of the time.
> 
> The worst part of the problem shows this warning when emacs
> freezes after emitting this on stderr when launched
> from the command line...
> $ emacs-29.2 &
> $ Warning:
>     Name: menubar
>     Class: XmRowColumn
>     XtGrabPointer failed.
> If launched from the window manager, you can still get the freeze,
> but you obviously won’t see the warning.  So as the warning says,
> it is an attempt to activate the menubar (for me, its Files or Buffers).
> But this doesn’t happen every time.  What does happen every time
> is that clicking on the menubar leads to a 10 to 20s pause (but it
> really seems longer).  Sometimes you don’t realize that nothing is
> happening and you continue clicking or typing.  And occasionally,
> this will lock-up emacs (emit the warning) 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 this is very annoying since you have
> 
> to restart emacs (and of the course the menubar lag).
> 
> Perhaps, this has over-loaded some event handler?
> But you can exit normally.  Hopefully that helps.