Enhance the VAO docs

Make it clear that the class is usable regardless of the OpenGL version
the app is targeting. It may just do nothing.

Change-Id: I50e68a46e36ef1f4694016311af93c6f8719ce4f
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Fix linking of tst_qwindow with dynamic Open GL.

Task-number: QTBUG-40696
Change-Id: If80a5e9b96e2eb7e50e02eefbe6e54d0b028c144
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Improve QOpenGLWidget docs regarding fb preservation

QOpenGLWindow already has some notes regarding this. It must be
mentioned in QOpenGLWidget too.

Change-Id: I0af90c9410a1c44cb9dd9ce58aa0371a58c57f65
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
qmake: Add QMAKE_SONAME_PREFIX variable

If defined, the value of this variable is prepended to the built shared
library's SONAME identifier.

For more information, see: qmake/doc/src/qmake-manual.qdoc#qmake-soname-prefix

Task-number: QTBUG-31814
Change-Id: I4bceaf0c93162e4fad6bb424af1b82e74d38acdc
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Windows styles: Avoid theme.rect recalculation

In both cases theme.rect calculated right after the
"sub & SC_ScrollBarSlider" test.

Change-Id: I9fa0c4e1327e68b4184674a13e7a4bf362f8deff
Reviewed-by: Adam Majer <adamm@zombino.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
QRegion: remove check for null ptr after "new" operator

Change-Id: Iebba0b1f024e22cd36a04c53377b3958638b389e
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Fix typo in QMetaType documentation.

Change-Id: I934b68978fb32a518ed7cf9b47f1600982f58f66
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>