> It seems that variables `x-gtk-resize-child-frames' and
> `x-gtk-use-window-move' do not help with this.
As expected.
> I am using KDE with KWin (X11) version 5.27.7. I don't know where there is
> any known issue on this platform.
AFAICT KDE does not have any such problems.
>>From another perspective, is there a way to perform resize and move at the
> same time?
We could try gdk_window_move_resize but we'd have to (1) investigate
whether it works well for child frames and (2) what to do on non-GTK
platforms.
> (I mean, could the two steps be executed within a single redisplay cycle,
> so that users would not see the intermediate changes?)
> If these two steps are not done separately, the execution order would not
> matter.
> As I wrote in my first email, I can see the child frame being moved and
> then resized
> on my computer, even though the two steps happen very quickly.
What happens when you change 'x-wait-for-event-timeout' to zero?
martin