bug#63283: Emacs crash within fontset

[Eli Zaretskii]

> Date: Mon, 08 May 2023 21:22:21 +0000
> From: Seppo Ronkainen <sodr80@protonmail.com>
> Cc: 63283@debbugs.gnu.org
> 
> Your suggested patch successfully avoided the abort, great !
> 
> Where the abort would previously occur now instead the buffer renders all 
> characters with four digit code point rectangular representations which I 
> would consider preferable to an abort the entire emacs server session with 
> thirty or so windows. Tested with visiting a large file emacs/src/xdisp.c and 
> Emacs swapps back to render regular characters when text is scaled back. I 
> would vote for your suggested fix, well done thank you !

Displaying the characters as hex codes is the expected behavior in
this case, since Emacs is unable to find a font that suits its needs.

So I've now installed the change on the emacs-29 branch, and I'm
closing the bug.

Thanks.