https://bugs.kde.org/show_bug.cgi?id=477737
Bug ID: 477737
Summary: KWIN includes window decorations in the size of new
windows for SSD (xdg_toplevel)
Classification: Plasma
Product: kwin
Version: 5.27.9
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: ideasma...@gmail.com
Target Milestone: ---
Logical error with new windows under WAYLAND & server-side decorations, where
the surface size is used to create a new window that includes the window
decorations.
This means creating a surface 500x500 then using XDG top-level to assign server
side decorations will create a 500x500 window, shrinking the applications
surface (e.g. 480x494) in the `configure` callback. Since there is no way to
access the decoration size there is no way to create a window with a
predictable surface size.
This was reported to Blender, which stores & restores the size of the
file-selector.
This results in the window shrinking each time it's displayed, see:
https://projects.blender.org/blender/blender/issues/113059
Video:
https://projects.blender.org/attachments/d781be36-c778-452b-8115-f96310d46329
----
STEPS TO REPRODUCE
1. Open Blender [versions `3.6.x`, `4.0`, `4.0.1`].
2. Press Ctrl-O (the file selector will display).
3. Move the cursor over the window and press Escape (closing the file
selector).
4. Repeat steps 2 & 3.
OBSERVED RESULT
The window shrinks each time.
EXPECTED RESULT
The `xdg_toplevel_listener::configure` callback should not include window
decorations in the `width` & `height` arguments. Instead, the existing surface
size should be used unless there is a reason to constrain them (window size
exceeds monitor size for e.g.).
SOFTWARE/OS VERSIONS
Windows: NA
macOS: NA
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.27.9
Qt Version: 6.6.0
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