https://bugs.kde.org/show_bug.cgi?id=426412
--- Comment #11 from Draget ---
Additional info:
when killing kwinX11, everything is smooth (without window decorations) again.
Restart kwinX11 re-introduces the issue again.
kwin_X11 startup log:
```
Warning: Setting a new default format with a different version or profile after
the global shared context is created may cause issues with context sharing.
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource
id: 65011731, major code: 20 (GetProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource
id: 65011731, major code: 20 (GetProperty), minor code: 0
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5089:46: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5091:48: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5093:48: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5097:47: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5099:46: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5107:48: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5111:46: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5113:46: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5117:45: this
compose sequence is a duplicate of another; skipping line
kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5120:46: this
compose sequence is a duplicate of another; skipping line
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 3995, resource
id: 14680119, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3996,
resource id: 14680119, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 4043, resource
id: 14680138, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 4044,
resource id: 14680138, major code: 14 (GetGeometry), minor code: 0
OpenGL vendor string: Intel
OpenGL renderer string: Mesa Intel(R) UHD Graphics (CML GT2)
OpenGL version string: 4.6 (Compatibility Profile) Mesa 21.2.6
OpenGL shading language version string: 4.60
Driver: Intel
GPU class: Comet Lake
OpenGL version: 4.6
GLSL version: 4.60
Mesa version: 21.2.6
X server version: 1.20.14
Linux kernel version: 5.14.16
Requires strict binding:yes
GLSL shaders: yes
Texture NPOT support: yes
Virtual Machine:no
kwin_core: XCB error: 10 (BadAccess), sequence: 4283, resource id: 1977, major
code: 141 (Composite), minor code: 2 (RedirectSubwindows)
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 4829,
resource id: 39856754, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 4830,
resource id: 39856756, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 4831,
resource id: 39856758, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 4832,
resource id: 39856768, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 4833,
resource id: 39856770, major code: 14 (GetGeometry), minor code: 0
```
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