The qHash() overload was missing the seed argument and returned only
32-bits, even on 64-bit platforms, since it was never ported from Qt 5
to Qt 6 style.

Fix by rewriting the overload to idiomatic form, to wit:

- make it a hidden friend
  - since it was out-of-line, I opted to add a hash() member function
    so we don't need to overload
- mark as noexcept
- add the seed argument and port to size_t
- implement using qHashMulti instead of rolling your own combiner
- move the implementation beside operator== to enable easy
  side-by-side comparison for consistency

Pick-to: 6.11 6.8
Task-number: QTBUG-145851
Change-Id: I90d1f00ced0d3d24d52d3667de5ad664af14e07c
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

After ensuring this header is never installed, we can now just add the
missing seed argument to avoid using the 1-to-2-arg-qHash adapter
here, which we'll phase out (deprecate/=delete).

A proper fix would add a qHash() hidden friend to the public class
itself. That won't be pickable to old branches, so has to happen in a
follow-up.

Pick-to: 6.11 6.8
Task-number: QTBUG-145851
Change-Id: I062cf7dc7ea4c1fbbfa749bef9e452075c284257
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

... because it clearly isn't made for being installed
(QT_USE_NAMESPACE).

Using #pragma once instead of manual header guards will ensure this,
because syncqt.cpp has a check.

Amends 4e570cc94fd10dd92ec1dbb117964d3a9748f48b (5.0).

Pick-to: 6.11 6.8
Change-Id: I9bae89b4322942295b7f1685f9110304dbb0ce95
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

Point potential contributors to contribute.qt-project.org.

Change-Id: Iac61882d2f509a466c6ca488700e3b0f0aed395e
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

Change-Id: If6b429563807bb5465f2eff186b7a50257e11004
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

This prevents QDoc from choosing the C++ module page with the same name.

Change-Id: Ib73439c4f3d6df73c89b514c0448fcbe5245caad
Reviewed-by: David Boddie <david.boddie@qt.io>

Change-Id: I34a10d3015deb6a4611235afe75db4eab362f8e5
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

Change-Id: I039e667bfb2b69856acce6c113d167d03ae6e1eb
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

Mark all files as security significant because they are just
some headers with definitions in namespace QLocation and
a single cpp-file with documentation of these.

QUIP: 23
Fixes: QTBUG-144467
Pick-to: 6.11 6.10 6.8
Change-Id: I265259a0273755bf089da9adb8cbe2eaf742c7d0
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

Mark all files as security significant because they are QML
bindings to objects to place on a map. The exception to this
is qdeclarativegeomap.cpp, which is the map itself, but it
uses plugins to fetch the map data, so that isn't critical
either.

QUIP: 23
Fixes: QTBUG-144466
Pick-to: 6.11 6.10 6.8
Change-Id: Ib072b0ec98ae47a5d6b67183e5f735537ff422fa
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>