bug#61667: 29.0.60; Failure to redisplay

[Po Lu]

Dmitry Gutov <dgutov@yandex.ru> writes:

> Hovering the mouse over the mode-line does trigger the necessary
> redisplay. Alt-Tabbing to another window and then back also does
> that. Is that relevant?
>
> Simply moving the mouse (not over the mode-line) doesn't help.
>
> The refresh can also happen on its own, in 1-2 seconds.

I think this isn't a problem with the GLib input code then.

Alt-tabbing makes the X event reading code explicitly ask for a
redisplay.  If you build --with-checking=yes,glyphs and call
`trace-redisplay', what happens when the redisplay does not happen?

Thanks.