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Only consider QScreen virtual siblings that have been added

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If a platform builds up a list of QPlatformScreens, and then adds
them incrementally, while at the same time implementing virtualSiblings
in QPlatformScreen to return the full list of screens, the virtual
sibling QScreens will contain nullptrs for each non-added screen.

It could be argued that this is the fault of the platform plugin,
since it's reporting a virtual sibling that it hasn't added yet,
but we can easily work around it in QScreen as well.

Fixes: QTBUG-113977
Pick-to: 6.5
Change-Id: I4b9472646a5cc10b6fd35c606e3ae15941da1587
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
This commit is contained in:
Tor Arne Vestbø 2023-05-30 18:01:19 +02:00
parent 672a1d022c
commit ea1af6b7ed
1 changed files with 5 additions and 2 deletions
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7
src/gui/kernel/qscreen.cpp
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@ -360,8 +360,11 @@ QList<QScreen *> QScreen::virtualSiblings() const
const QList<QPlatformScreen *> platformScreens = d->platformScreen->virtualSiblings();
QList<QScreen *> screens;
screens.reserve(platformScreens.size());
for (QPlatformScreen *platformScreen : platformScreens)
screens << platformScreen->screen();
for (QPlatformScreen *platformScreen : platformScreens) {
// Only consider platform screens that have been added
if (auto *knownScreen = platformScreen->screen())
screens << knownScreen;
}
return screens;
}