Update window flags from QToolBarPrivate::endDrag().

Activate previously #ifdef'ed code which cleared
the Qt::X11BypassWindowManager hint. With the hint
set, the tool bar stays on top and does not get deactivated
along with the application by the WM.

Task-number: QTBUG-41189
Change-Id: I6f3f334860e46dd4867f5942f15e5a090340f2d7
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
Widgets: be more careful when setting focus on touch release

An application might choose to change focus when receiving mouse/touch
press/move events. This is in conflict with Qt assigning focus on touch
release (QPlatformIntegration::SetFocusOnTouchRelease), since Qt
might then reassign focus to something else.

An example of this is seen with the "frozencolumn" example. Here, when
the user double clicks on a cell, the application creates an 'edit'
widget inside the cell that gets focus. But at soon as the last release
is sent, Qt will change focus to the focus proxy of QScrollArea instead.

This patch will introduce an exception to setting focus on release, so that
we only set focus if we detect that focus didn't change (by the app)
while processing press/move events.

Task-number: QTBUG-39390
Change-Id: I7b398b59e3175265afd2fcd938e11f88155abc89
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>
Take ShareOpenGLContexts into account in QOpenGLWindow

While the attribute was originally intended for widgets (QOpenGLWidget,
QQuickWidget) only, we need a way to get multiple QOpenGLWindow instances
whose contexts share with each other.

Change-Id: Ib983c9c2815b0a3911bc504ffad8d8dddad192aa
Reviewed-by: Jørgen Lind <jorgen.lind@theqtcompany.com>