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(With
frameworks/extra-cmake-modules!145
we have disabled the C and C++ specific compiler extensions.)

Allow the request to go through even when there's no surface.
Don't crash if we pass a nullptr QWindow.

Qt private headers don't have the dependencies they should have, hence
the solution is to explicitly add them.

CCMAIL: apol@kde.org

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While that returns a WinId, those are from the compositor and not related to
the internal WinIds from the calling application itself. Most uses of
KWindowSystem rely on that though, and so acted on a random other window
instead.

BUG: 436498

Highlight window and present windows APIs have been deprecated in 5.82.

As discussed in https://mail.kde.org/pipermail/plasma-devel/2021-February/119329.html

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This makes it easier to build against both Qt5 and Qt6

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QtWayland doesn't attach a null buffer to a wl_surface to unmap it,
instead it destroys the wl_surface. This is not wrong, but it breaks a
lot of assumptions about the way how the qpa manages window system
resources.

With this change, KWindowShadow will start using heuristics to keep
track of window system resources and when needed, re-create shadow
objects. We need to use heuristics because there is nothing in public
API that we can use.

It's worth noting that QtWayland provides a private API that you could
use to get notified when the wl_surface object has been destroyed. But
we should use private APIs only if there is no other way around. In
this particular case, we have one (QEvent::Expose and QEvent::Hide).

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We agreed to use C++17 in Plasma. Document this decision here

${PLUGIN_INSTALL_DIR}/kf5/org.kde.kwindowsystem.platforms/ is now an
obsolete installation destination for KWindowSystem platform plugins.

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Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: davidedmundson, plasma-devel

Tags: #plasma

Maniphest Tasks: T12496

Differential Revision: https://phabricator.kde.org/D26458

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