[konqueror] [Bug 500173] Spurious windows while generating HTML preview in Wayland

[Stefano Crocco]

https://bugs.kde.org/show_bug.cgi?id=500173

--- Comment #8 from Stefano Crocco <stefano.crocco at alice.it> ---
(In reply to Konstantin Ivanov from comment #6)
> Here's an update and a possible workaround: I've posted the story about this
> issue on another forum (in Russian,
> https://www.linux.org.ru/forum/development/17886472), and a good Samaritan
> there suggested that it's possible to patch kio-extras to utilize Qt
> Platform Abstaraction forcing off-screen rendering, and he even made a
> patch. It's just one line in thumbnail.cpp before QApplication app
> declaration:
> 
>     qputenv("QT_QPA_PLATFORM", "offscreen");
> 
> IMHO it's a wise choice anyway because no thumnailer plugin should be
> allowed to draw on the screen. I've tested it, and it works for me (just
> /lib/qt6/plugins/kio/thumbnail.so needs to be recompiled).
> I'm attaching a patch to this report because I'm not sure how to proceed
> from here. Is this a good solution? Would someone like to make a merge
> request? I've never done it but I can try if you approve of it.

Thanks for the suggestion. In my opinion, it's worth trying to do a merge
request for kio-extras. As for "approving" your suggestion, I think it's better
leaving it to the kio-extras people because they know the code better than I
do.

In the meanwhile, I tried reproducing the bug in virtual machines with older Qt
versions: I couldn't reproduce it with a version of KDE Neon using Qt 6.8.0 but
it happened with a version using Qt 6.8.2, so I think it's something which
happened between these two releases. Unfortunately, I think that the KDE
frameworks version were different between the two cases, so I'm going to try
writing a minimal Qt-only program showing this issue. I don't think I'll have
time to do that before the week-end, however.

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