https://bugs.kde.org/show_bug.cgi?id=466804
Bug ID: 466804
Summary: OpacityMask feature in QML broken rendering apps
unusable
Classification: Plasma
Product: plasma-integration
Version: 5.27.2
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: benmorde...@protonmail.com
Target Milestone: ---
Created attachment 156980
--> https://bugs.kde.org/attachment.cgi?id=156980&action=edit
Opacity Mask Failure
Examples of problem apps are Kasts and Nextcloud Desktop Client. Opacity mask
fails to work causing opaque rectangles to obscure the program's important
content. Initially filed bug report to Kasts
(https://bugs.kde.org/show_bug.cgi?id=466274) but discovered that same problem
shows up in other apps. With both Nextcloud and Kasts I was able to disable the
opacity mask in the source code and prove the content was there but covered by
an opaque rectangle.
The Nextcloud AppImage does not have the bug, but the official repositories do.
Discussion and troubleshooting steps on the Arch Linux here: bbs:
https://bbs.archlinux.org/viewtopic.php?id=283774
Other apps like Neochat and Monero Gui also have visual bugs, but I have done
no similar troubleshooting. As mentioned in the Arch bbs post, the visual bug
can also be eliminated by setting QT_QPA_PLATFORMTHEME=gtk3 before executing
kasts.
STEPS TO REPRODUCE
1. Install a program that uses QML OpacityMask
2. Run program
OBSERVED RESULT
Opaque rectangles.
EXPECTED RESULT
Transparent rectangles for proper UI.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.27.2
(available in About System)
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
Exclusive X11 system. Nvidia drivers.
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