bug#41124: 26.3; highlight regexp not working properly - not updating as you type

[Eli Zaretskii]

> From: jan <rtm443x@googlemail.com>
> Date: Thu, 7 May 2020 16:36:02 +0100
> Cc: 41124@debbugs.gnu.org
> 
> But FWIW I found this originally happening in another mode where I was
> trying to identify large chunks easily.

Which mode was that?

> M-x describe-mode gives
> 
> Enabled minor modes: Auto-Composition Auto-Compression Auto-Encryption
> Blink-Cursor Diff-Auto-Refine Electric-Indent File-Name-Shadow
> Font-Lock Global-Eldoc Global-Font-Lock Line-Number Menu-Bar
> Mouse-Wheel Tool-Bar Tooltip Transient-Mark

These are minor modes.  The font-lock operation is determined by the
major mode.  You can tell what major mode is active in a buffer with
this:

  M-: major-mode RET