bug#71223: 30.0.50; stack overflow after very fast opening and closing of frames

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

>> If at all possible, I'd rather not wait (register a callback instead).
>> As a general rule `sit-for` is a source of problems in ELisp code.
> I didn't mean to wait in sit-for, I meant to wait ion a way that
> doesn't read input from processes and doesn't do redisplay.

I really meant "If at all possible, I'd rather not wait" to apply to any
kind of waiting.  The second sentence (about `sit-for`) was correlated
but not directly connected.

> Queueing timers will not solve the problem, I suspect, but will likely
> get us into a different one, since timers are run by the main loop.

Why would running them from the main loop be a problem?


        Stefan