https://bugs.kde.org/show_bug.cgi?id=448961
Bug ID: 448961
Summary: Window jumps to differnet location when dragging it by
the menu bar
Product: kwin
Version: 5.23.90
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: maiphi.pub...@gmx.net
Target Milestone: ---
SUMMARY
For some non-KDE applications that can be dragged from the menu bar (or other
window content), the window can suddenly jump to a different location when
dragged.
I observed this behaviour with VLC, SMPlayer and Libre Office on KDE Neon user
and testing 20220118 and openSUSE Krypron from today (and a similar issue on
Tumbleweed, see below).
STEPS TO REPRODUCE
1. Play a video with VLC or SMPlayer (it is important to play a video, the bug
may not occur otherwise).
2. Left-click and hold the menu bar (in case of SMPlayer the video region can
be used as well).
3. Drag the window.
OBSERVED RESULT
The window suddenly jumps to a different location so that its top left corner
is now under the pointer. It may also happen that the leftmost menu opens
either together with the jump, or without.
In openSUSE Tumbleweed (Plasma 5.23.5) the issue is a bit different: instead of
the jumping window we have a jumping mouse pointer. The pointer suddenly jumps
to the top left corner of the window, whereas the window itself stays where it
is.
EXPECTED RESULT
The window should smoothly follow the mouse pointer when dragging. Neither the
window nor the pointer should jump to a different location.
REPRODUCIBILITY
In principle the problem is always reproducible, but not always with the same
applications on the same distribution, so please try all of the three mentioned
above if you don't see the problem immediately. E.g. Libre Office 6 seems not
to be affected on Neon in contrast to Libre Office 7 on the openSUSE systems.
SOFTWARE/OS VERSIONS
Linux: KDE Neon user or testing 20220118, openSUSE Krypron or Tumbleweed from
22.01.2022,
KDE Plasma Version: 5.23.90 (5.23.5 in Tumbleweed)
KDE Frameworks Version: 5.91.0 (5.90.0 in Tumbleweed)
Qt Version: 5.15.2
ADDITIONAL INFORMATION
The Problem with the jumping mouse pointer first occured mid-2021 if I remember
correctly. The jumping window case only happens in the current testing version
of KDE.
Note that the problem doesn't show up if the window is dragged by the title
bar.
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