bug#45898: 27.1; wedged in redisplay again

[Gerd Möllmann]

> Yes, I know; and it's still the case.  Originally, I indeed only
> looked at redisplaying_p.  But then cases with C-n and C-v wouldn't be
> caught, because these commands, although they call the display code,
> run without redisplay_internal in the call stack.  And very sluggish
> response from these and similar commands is generally perceived as
> "redisplay problems".  So I wanted to catch them as well, without
> waiting for redisplay cycle they cause (which by itself may or may not
> be "too slow" -- just moving the cursor is an optimization there, as
> you know).

Do you have a recipe for reproducing that?

I might take at look into this, if/when I manage to debug Emacs on my M1.