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In C++20 there are new classes that have member functions named emit().
c.f.:
https://lists.qt-project.org/pipermail/development/2020-February/038812.html
https://en.cppreference.com/w/cpp/io/basic_osyncstream/emit

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NO_CHANGELOG

From [1] and [2]:
- Always pass a parent when creating a QObject, otherwise it could leak if
  not deleted manually
- During refactoring it creates the risk of a layout being created and
  unused, and therefore leaked because it has no parent

[1] https://codereview.qt-project.org/c/qt/qtbase/+/318964/2
[2] https://codereview.qt-project.org/c/qt/qtbase/+/321252

Qt::MidButton is equal to Qt::MiddleButton and it was removed in qt6

This is needed for an autotest in kwayland-server.

Having the macro's definition of the operator| in the namespace of the
flags argument improves/unbreaks things for the argument-dependent
lookup of unqualified function names, e.g. when flags are combined in
calls of other methods, but there is some other operator| defined in the
namespace of the current code.

Given Q_DECLARE_OPERATORS_FOR_FLAGS creates inlined functions, this
should be a source and binary compatible change.

Qt did similar for Qt 5.12 in
https://codereview.qt-project.org/c/qt/qtbase/+/225348

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Offer a PlasmaWindow::uuid so we can identify windows when communicating
with the compositor.
Deprecates the internalId which is the entire reason why this was ported
(that it isn't stable enough).

See https://community.kde.org/Frameworks/Frameworks_Logging_Policy

The <linux/input.h> header doesn't necessarily exist on FreeBSD
(it is provided by ports, which aren't required for the rest
of KWayland it seems). Test *testRemoteAccess* uses that header,
but doesn't actually need it; just drop the #include.

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