bug#56561: 29.0.50; Infloop in try_window

[Eli Zaretskii]

> Cc: mwd@md5i.com, 56561@debbugs.gnu.org
> Date: Fri, 15 Jul 2022 18:37:50 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> On third thought, why do we even call try_window there?  The original
> code needed try_window because it then used the glyph matrix it
> produces to calculate the size of the tooltip.  But we've dumped that
> code, and we nowadays use window-text-pixel-size instead, which
> emulates the display internally anyway.  So I think we should simply
> delete the call to try_window from x-show-tip, and be done.  At least
> on master.

No, that's wrong: we call update_single_window there, and that
requires a window with a desired matrix set up correctly.  So yes, the
call to try_window is still needed.