https://bugs.kde.org/show_bug.cgi?id=480210
Bug ID: 480210
Summary: apps (kdevelop, konsole, ...) windows shrink when tabs
are added/closed
Classification: Plasma
Product: kwin
Version: 5.27.10
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: m...@milianw.de
Target Milestone: ---
SUMMARY
Since some time now some applications shrink when one interacts with them, and
I believe this is not a reaction to a application side request, but rather
something in the stack somewhere leading to this issue. I don't know if it's
KWin or Breeze or whatever triggering this, as I'm not well acquainted with how
this stack works.
STEPS TO REPRODUCE
1. open konsole
2. open tabs in konsole
alternatively:
1. open kdevelop
2. open some files
OBSERVED RESULT
the main window shrinks a little for every tab opened, kdevelop also resizes
slightly when closing tabs.
Here's a backtrace I got by setting a breakpoint in `QWindow::heightChanged`,
but note how it reacts to a XCB event - any suggestion on how I could track
down where that async request originates?
```
Thread 1 "konsole" hit Breakpoint 3, QWindow::heightChanged
(this=0x605c72e597b0, _t1=658) at .moc/moc_qwindow.cpp:776
776 {
(gdb) bt
#0 QWindow::heightChanged(int) (this=0x605c72e597b0, _t1=658) at
.moc/moc_qwindow.cpp:776
#1 0x000075de04745a03 in
QGuiApplicationPrivate::processGeometryChangeEvent(QWindowSystemInterfacePrivate::GeometryChangeEvent*)
(e=<optimized out>) at kernel/qguiapplication.cpp:2617
#2 0x000075de0472a6f5 in
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(flags=flags@entry=...) at kernel/qwindowsysteminterface.cpp:1169
#3 0x000075ddfd92f560 in xcbSourceDispatch(GSource*, GSourceFunc, gpointer)
(source=<optimized out>) at
/usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:105
#4 0x000075de023acf69 in g_main_dispatch (context=0x75ddf8000ec0) at
../glib/glib/gmain.c:3476
#5 0x000075de0240b367 in g_main_context_dispatch_unlocked
(context=0x75ddf8000ec0) at ../glib/glib/gmain.c:4284
#6 g_main_context_iterate_unlocked.isra.0
(context=context@entry=0x75ddf8000ec0, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:4349
#7 0x000075de023ab162 in g_main_context_iteration (context=0x75ddf8000ec0,
may_block=1) at ../glib/glib/gmain.c:4414
#8 0x000075de042ead0c in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x605c72ba50a0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#9 0x000075de0429ac04 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7ffce35b5580, flags=..., flags@entry=...) at
../../include/QtCore/../../src/corelib/global/qflags.h:69
#10 0x000075de0429c0a3 in QCoreApplication::exec() () at
../../include/QtCore/../../src/corelib/global/qflags.h:121
#11 0x0000605c7106db15 in ()
#12 0x000075de03a45cd0 in __libc_start_call_main
(main=main@entry=0x605c7106c020, argc=argc@entry=1,
argv=argv@entry=0x7ffce35b5898) at ../sysdeps/nptl/libc_start_call_main.h:58
#13 0x000075de03a45d8a in __libc_start_main_impl (main=0x605c7106c020, argc=1,
argv=0x7ffce35b5898, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffce35b5888) at ../csu/libc-start.c:36
```
Note that I'm on Arch, but a colleague reproduced the same issue on OpenSuSE.
Both of us use X11.
EXPECTED RESULT
the mainwindow doesn't change size
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.27.10
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.27.10
Qt Version: 5.15.12
ADDITIONAL INFORMATION
I'm happy to help with debugging this if anyone can provide me further
suggestions on what to investigate here. If this is not kwin related, then
please point me to the suggested place to report this instead.
Thanks
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