bug#50462: 27.2; emacsclient syntax highlight failure

[Eli Zaretskii]

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> From: RDS <rds1944@gmail.com>
> Date: Tue, 7 Sep 2021 12:51:16 -0700
> 
> Eli
> 
> Read further into my bug post:
> 
> "Launch emacs as a server. A buffer has a bash or elisp script with 
> font-lock-mode enabled (syntax
> highlighting). It looks just fine. Then, I switch to another buffer & when I 
> return, part of the file is not visible.
> Close inspection shows that only text encoded as strings is rendered 
> black-on-black or
> white-on-white. Disabling font-lock-mode shows nothing is missing! Again 
> enabling font-lock-mode &
> the same text is missing. Killing the buffer & reloading does not fix the 
> problem. At this point opening any new
> bash or elisp file with strings is futile. The only way to correct all is a 
> restart of the daemon! Of course, any
> setup of screens / consoles is lost. However, no data is ever lost or 
> damaged."
> 
> And yes, C-f, C-b are fine. ALL is fine except for string highlight! (.c are 
> ok, org mode are ok, ...)
> 
> Nothing unusual in *Messages*.
> 
> Weird!

So it sounds like the faces lost their colors or something.  When the
problem happens, what does "M-x list-faces-display RET" show for the
font-lock faces: do they appear in their normal colors?