https://bugs.kde.org/show_bug.cgi?id=526679
Bug ID: 526679
Summary: Stale size in xdg_toplevel.configure overrides a
fixed-size window that resized right after mapping
Classification: Plasma
Product: kwin
Version First 6.7.4
Reported In:
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
When a fixed-size window (min size == max size) changes its size right after it
is mapped, KWin can send an xdg_toplevel.configure with the size of the first
commit afterwards. Qt applies it, so the window ends up at the old size while
its contents expect the new one.
This happens with the Albert launcher: the window is shown with only the input
line (height 229), the results arrive a few ms later and the window sets a new
fixed size (521). Shortly after, KWin sends configure(1034, 229) together with
the activation. The window stays squeezed until it is hidden again.
It is a timing issue. On AC power KWin replies within a few ms and the order is
harmless. On battery with the power-saver profile the reply takes up to ~300 ms
and it is reproducible every few tries.
STEPS TO REPRODUCE
1. Use a client with a fixed-size toplevel that sets a new min/max size and
commits a buffer of that size shortly after the first commit, before the
activation configure arrives (e.g. Albert with text left in the input, so
results show up immediately on show).
2. Switch to battery / power-saver profile to slow down the compositor reply.
3. Show the window repeatedly.
OBSERVED RESULT
WAYLAND_DEBUG=1 excerpt:
.914 -> xdg_toplevel.set_min_size(1034, 229) / set_max_size(1034, 229)
window shown
.918 <- xdg_toplevel.configure(0, 0, [])
.927 -> xdg_toplevel.set_min_size(1034, 521) / set_max_size(1034, 521) new
size committed
.963 <- xdg_toplevel.configure(1034, 229, [activated])
stale size
EXPECTED RESULT
No configure with a size that is outdated and outside the current min/max size.
For a floating window that cannot be resized either 0x0 or the current size.
SOFTWARE/OS VERSIONS
Linux: Debian forky/sid, kernel 7.1.3
KDE Plasma: 6.7.4
KDE Frameworks: 6.30.0
Qt: 6.11.2
Graphics platform: Wayland
ADDITIONAL INFORMATION
Qt not clamping the configured size to min/max is a separate issue, reported to
Qt as well. Downstream workaround:
https://github.com/albertlauncher/albert-plugin-widgetsboxmodel/pull/16
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