bug#57684: locked narrowing breaks existing code without an apparent way to repair

[Richard Stallman]

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  > It is still true.  The problem exists only with Lisp code that is run
  > when QUITs are either intentionally disabled, or when Lisp is run from
  > the display engine, where QUIT is caught and basically ignored.  The
  > particular case which started this thread is of the latter variety.

I never allowed redisplay to run Lisp code -- it seemed very dangerous.
An error there could leave redisplay data structures inconsistent.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)