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Re: Emacs's set-frame-size can not work well with gnome-shell?

From: Dmitry Gutov
Subject: Re: Emacs's set-frame-size can not work well with gnome-shell?
Date: Fri, 31 Jan 2020 04:22:11 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0

On 30.01.2020 21:41, martin rudalics wrote:
 > mouse.el.diff seems to solve the undecorated frame resizing
 > problem. No drift anymore, both with and without
 > frame-resize-pixelwise. So brief testing showed that it's okay now.

OK.  With an undecorated top-level frame, I presume.


 > mouse+xfns.diff, on the other hand, is more broken. First of all, it
 > didn't help resizing child frames (not discernible
 > difference).

With GTK you mean.


 > Second, it's very broken with desktop scaling (my 200%
 > makes dragging the frame behave very wildly). Without scaling it
 > almost works as well as the other patch, but not quite. For instance,
 > when mouse dragging by the bottom-right corner, at first the corner
 > jumps a little away from the cursor in the top-left direction, and
 > then follows it, more or less correctly, from that distance.

I didn't care about the scaling factors.  The most important aspect of
the second patch is that it should solve the X issue with slow child
frame resizing and moving (at least it does so here).  So you would have
to try it with a Lucid child frame, unscaled first.  I'll try to fix the
scaling issues later.

Okay, but actually the Lucid build doesn't have that problem with the scaled desktop. It "just works", or seems to. So I'm testing it with 200% scaling.

So, Lucid build, under Mutter:

- Resizing works, more or less. Moving a frame by its mode-line works as well without stutters. - The right-bottom corner still jumps away. When I drag the frame by the mode-line, it (the corner) also jumps at first, the same distance.
- Same with moving or resizing a child frame.
- tumashu's child frame moving test scenario is still slow.


  (benchmark 1 `(set-frame-position ,test-frame 50 50))
  => 0.5s

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