QtConcurrent::Median: add some qMove()

In case this code is ever instantiated with a type that actually benefits from moving.

'value' is save to move since it was passed to the function by value.
'*mid' is save to move since it originates in a container that will be
 discarded on the next line anyway.

Change-Id: I13587be10974ba6cf95d56e0f8912ff88167b60b
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
QTest: use nth_element to calculate the median

Sorting is O(NlogN) complexity, while nth_element is linear.

Change-Id: Ic6596affe183494e87abe7bdaa7c9985f5b7cd58
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Remove Q_NO_PACKED_REFERENCE

Leftover. It's not used anywhere.

Change-Id: I023a390d84c9ed5dacd2699145f183e8a2317153
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Remove the empty definition of Q_PACKED

Structs defined with Q_PACKED *need* to be packed in all
platforms. Having an empty define means errors might go unnoticed for
a long time.

Change-Id: I9c388358fed27a8e018465f05375e4bbbee3484c
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Remove Q_PACKED from structures that do not need to be packed

These structures do not need to be packed. With some compilers, Q_PACKED
was defined to be empty, which means that the code was working fine
without packing. Or there were some lingering problems on those
platforms (MSVC) and we're now exposing them in all platforms.

Actually, it shouldn't be a problem anywhere. QCharAttributes, quint24
and QFontEngineQPA::Glyph have only char/uchar members, so they're
packed already (they have alignof == 1). The only platform where that
wasn't true was ARM OABI, which we don't support anymore.

QFontEngineQPA::Header seems to always come from a QByteArray, so it
doesn't neeed to be packed either. However, just to be sure, I'm
inserting a check for alignment.

And QFontEngineQPA::Block isn't used anywhere.

Change-Id: Iacfa25edf336ef2a03aeb6e40ae90937a21661ae
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Bring back Qt4 X11 session management functionality.

Added QXcbSessionManager to the Xcb plugin.
QXcbSessionManager inherits from QPlatformSessionManager, it's a port of
QSessionManager as it is in Qt 4.8.
Minor changes also in QPlatformSessionManager and QGuiApplication to
hook it up.

Task-number: QTBUG-28228
Task-number: QTBUG-30011
Task-number: QTBUG-33033
Change-Id: I50b33d05a1e32c5278dea339f693713acc870a70
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: David Faure <david.faure@kdab.com>
Adding QPlatformMessageDialogHelper and QMessageDialogOptions

We plan to add support for native message/alert dialogs on Android
and iOS because it's otherwise impossible to have a true popup window.
Then we might as well have native message/alert dialogs on other
platforms too.  It will become an alternative implementation behind
QMessageBox and perhaps QErrorMessage.

Task-number: QTBUG-30883
Task-number: QTBUG-29462
Change-Id: I73dcfc6438e696189b6d37091874c7ad69b4ec68
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
moc: add -M<key=value> to ease static qml plugin linking

A module plugin in qml belongs to a URI/namespace. This
uri is resolved run-time by QtDeclarative by knowing the
path of the qmldir that references the plugin.
For static plugins this becomes a problem, since we lost
the information regarding which plugin belongs to which
qmldir, since a static plugin has no file path.

To avoid pushing the responsibility of clarifying this
onto the application developer, it is better to embed this
information into the meta data of the plugins themselves.
Since this information can be resolved by the
build system, a new option to moc has been added:
-M<key=value>
that will let you add meta tags to the meta data from
the command line to each class that has an IID specified.
For the URI case, we can then e.g do:
-Muri=QtQuick.Controls -Muri=QtQuick.Controls.Private

Change-Id: I81a156660148fc94db6f3cac0473e9e1c8458c58
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>