Bug#1026884: Re : Bug#1026884: xfwm4: Reserved space through _NET_WM_STRUT property ignored

[Sébastien Dufromentel <elzen@fadrienn.irlnc.org>]

On 25/12/2022 20:23:59, Yves-Alexis Perez wrote:
> control: tag -1 unreproducible moreinfo
>
> On Fri, 2022-12-23 at 13:38 +0100, Sébastien Dufromentel wrote:
> > Since the 4.18, it looks like Xfwm ignore such property: when I  
> maximize some
> > windows, they take the whole screen size and thus cover those  
> reserved spaces,
> > which is a bit problematic. The other WM I have on this computer,  
> Compiz and
> > Sawfish, still reserve space perfectly. I rollbacked to 4.16 using  
> the bullseye
> > package, and it works again too, so it looks like something very  
> specific to
> > this version of this particular WM.
>
> Hi Sébastien, could you add more details on your configuration and  
> especially
> which applications use those reserved spaces? I didn't experience  
> this issue
> here at least with a standard Xfce desktop (so with xfce4-panel).
>
> Regards,
> --
> Yves-Alexis

Hi there, sorry for the response delay.

I indeed use a custom environment with Xfwm and not the classical Xfce.  
I just launch xfwm4 and some hand-made applications at startup through  
a ~/.xsession script.

Here's attached a minimal script (using Python3/Xlib) to create a panel  
window reserving space at the top of the screen. When Xfwm 4.16 (or any  
other classical WM) is running in a standalone way, space is indeed  
avoided by the maximized window, so we have the panel and the maximized  
window's titlebar next to each other; but when Xfwm 4.18 is running,  
strut is ignored and the panel and the maximized window's titlebar end  
at the exact same location.

Hope it'll help.

Regards,

#! /bin/python3
# coding: Utf-8

import time, array
import Xlib.display

disp = Xlib.display.Display()
screen = disp.screen()
geom = screen.root.get_geometry()

panel = screen.root.create_window(0, 0, geom.width, 24, 0,
    screen.root_depth, background_pixel=0xFF00FF00)
panel.change_property(disp.intern_atom("_NET_WM_WINDOW_TYPE"),
    disp.intern_atom("ATOM"), 32, array.array("I",
        (disp.intern_atom("_NET_WM_WINDOW_TYPE_DOCK"),)))
panel.change_property(disp.intern_atom("_NET_WM_STRUT"),
    disp.intern_atom("CARDINAL"), 32, array.array("I", (0, 0, 24, 0)))
panel.map()

while True:
    while disp.pending_events() > 0:
        ev = disp.next_event()
    time.sleep(0.01)