https://bugs.kde.org/show_bug.cgi?id=416672
Bug ID: 416672
Summary: Window displays dirty buffer contents when shown
before being completely drawn
Product: kwin
Version: 5.16.5
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: sanchezt...@gmail.com
Target Milestone: ---
Created attachment 125354
--> https://bugs.kde.org/attachment.cgi?id=125354&action=edit
Opening Discover
SUMMARY
If a window is set to visible before it's been drawn to it is displayed with
contents from a dirty buffer (in my case I see a copy of of what's seen in the
screen).
If this is only fixable by each application developer, then at least KDE apps
should not show the issue.
STEPS TO REPRODUCE
1. Start a program like Discover or LibreOffice
OBSERVED RESULT
A window frame is shown containing a static copy of what was in the screen
before starting the application
EXPECTED RESULT
Window should only be visible when it's fully drawn, not with dirty contents.
If this is not possible, at least it should show blank contents.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 19.10
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.4
ADDITIONAL INFORMATION
Kernel Version: 5.3.0-26-lowlatency
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-3770K CPU @ 3.50GHz
GPU Driver: NVIDIA Driver 430.50
Memory: 15.6 GiB of RAM
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