https://bugs.kde.org/show_bug.cgi?id=500173
Bug ID: 500173
Summary: Spurious windows while generating HTML preview in
Wayland
Classification: Applications
Product: dolphin
Version: 24.12.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: kivanov1...@gmail.com
CC: kfm-de...@kde.org
Target Milestone: ---
Created attachment 178429
--> https://bugs.kde.org/attachment.cgi?id=178429&action=edit
Notice the Wayland icon appearing for a short time in the panel on the left,
and the preview flickering in the center
SUMMARY
When HTML file previews are generated in Dolphin under Wayland session, extra
windows briefly appear. These windows have the default Wayland icon, no
decorations, and contain the preview itself. They windows grab focus so using
anything is nearly impossible when many previews are generated at once. This
only happens in Wayland session, everything's fine in Xorg. It doesn't happen
to other file types as far as I've noticed (tried text or images).
STEPS TO REPRODUCE
(I include the commands I ran in the Dolphin's terminal, but it can be
reproduced in other ways, for instance, when you already have a folder with
many html files such as a local website mirror)
1. Clear thumbnails cache (rm -r ~/.cache/thumbnails/)
2. Make an empty directory at least one step deep (mkdir -p test/html)
3. Create some basic html files in it (for i in {1..10}; do echo
"<body>Test</body>" > test/html/test$i.html; done)
4. Open directory ./test/html/ or even ./test/ in Dolphin (cd test/html)
OBSERVED RESULT
Several windows containing rendered html appear in the middle of the screen and
grab focus.
EXPECTED RESULT
Previews should be generated in the background without popping up extra
windows.
SOFTWARE/OS VERSIONS
Operating System: EndeavourOS
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.13.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-2520M CPU @ 2.50GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 3000
ADDITIONAL INFORMATION
I assume that this has something to do with how the preview plugin works, and
it is actually made by Konqueror, and they use QWebEngineView (I base my
conclusions on searching sources for "thumbcreator html" in GitHub, and I'm by
no means a specialist). The closest I've come to pinpointing the bug is
somewhere inside the function KIO::ThumbnailResult WebArchiveCreator::create
(https://github.com/KDE/konqueror/blob/56c8860135e64a04235fc44bb609408847c0ca2c/plugins/webarchiver/thumbnailer/webarchivecreator.cpp#L91).
Maybe it's rather a Qt's roblem and not KDE's, but I have no skills to
determine that :(
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