https://bugs.kde.org/show_bug.cgi?id=473358
Bug ID: 473358
Summary: Bad repaint region for window caption leaves artifacts
when text changes in tabletMode
Classification: Plasma
Product: Breeze
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: window decoration
Assignee: plasma-b...@kde.org
Reporter: m...@ratijas.tk
CC: kwin-bugs-n...@kde.org, uhh...@gmail.com
Target Milestone: ---
Created attachment 160944
--> https://bugs.kde.org/attachment.cgi?id=160944&action=edit
glitches
SUMMARY
With Tablet Mode (configurable in Workspace Behavior -> General Behavior ->
Touch Mode) window decorations of Breeze become almost twice as large. However,
when window caption text changes, it might leave a trail of artifacts due to
bad repaint region not extending enough to the bottom.
STEPS TO REPRODUCE
1. Enable Touch Mode
2. Switch web browser tabs, or force change window caption text to change
without resizing the window.
3. Resize the window.
OBSERVED RESULT
After step 2 you might get glitches artifacts as shown on the picture. After
step 3 it should fully repaint and become normal.
EXPECTED RESULT
Text should repaint its full height.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10
Kernel Version: 6.4.10-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970M/PCIe/SSE2
ADDITIONAL INFORMATION
I use default AlignCenterFullWidth title alignment mode.
I *suspect* the offending code is in function Decoration::captionRect() or in
Decoration::paintTitleBar which is the only client of captionRect. It could as
well be Decoration::captionHeight() because it does not seem to be accounting
for neither touch mode or font size.
It could also be a rounding error when converting QRectF::toRect()
> QRect
> boundingRect(settings()->fontMetrics().boundingRect(c->caption()).toRect());
unlikely, however, because fontMetrics' height is disregarded in favor of
captionHeight()
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