bug#46827: Broken initial size of GTK3 frame

[martin rudalics]

>> Please try to provide some sort of recipe to reproduce this.  Ideally
>> without Gnus because I never used it.  Also, I've never seen a frame
>
> Sorry, not easy to distill many different things Gnus does to massage windows
> into a simpler test case.

I understand.  But since nobody else has reported a similar issue till
now, I strongly suspect that `display-buffer-in-tab' is triggering it.

>> "flash".  Is that a new frame?  Is there anything broken in the frame
>> after the flash?
>
> It's in the same frame, and nothing is broken after the flash.
> The visual effect is that after creating a new tab, everything
> is erased on the frame including tab bars and the mode line
> for a short time, and then redrawn back.

If this is GTK can you try with `x-wait-for-event-timeout' set to say 10
and tell whether that "flash" then takes ten seconds?  Here I've never
seen that "everything is erased on the frame" - usually some garbage
from elsewhere remains ...

martin