Do not check for !IsRenderBuffer

Unlike the newer QOpenGLFramebufferObject, QGLFramebufferObject still
contains some unfortunate tests for !IsRenderBuffer when creating
renderbuffers. Removing these tests avoids asserting in debug builds
on drivers that are not conformant to the GL spec in this respect.

This means that the qgl autotest is now passing on such drivers too.
The tests do not make much sense in the first place since Qt is not
a conformance test suite.

Change-Id: I21d6272cd5cef9dd71eab57e46771d3ce7dacbfb
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
QTabWidget: fix moving of the current tab

Task-number: QTBUG-36455
Change-Id: I38687283d60fe38a4b586b064d5ddd4ed3be06b6
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
Reviewed-by: Ivan Komissarov <ABBAPOH@me.com>