Re: Nested sit-for's

[Chong Yidong]

> I don't know if it is related, but from time to time (at least a few
> times daily), the cursor disappears, and doesn't return until I
> do "something" (e.g. click the mouse or type a key).
>
> I use blinking cursor, but when this happens, it typically seems to
> happen immediately after some event that updates part of the screen
> (like buffer switching), i.e. not as an effect of first showing the
> cursor and then "blinking it off".

If this is true, maybe it is a redisplay bug.

Could you try interrupting Emacs through gdb when this occurs, and
inspecting Vtimer_list to see if the `blink-cursor-timer-function'
timer is still active?

Another avenue of investigation is to add (redisplay) to
`blink-cursor-timer-function'.  If that stops the problem, that means
there is a redisplay bug.

I have unfortunately been unable to reproduce this bug.