Fix uninitialized value warning in QFontEngineFT.

When running an application which called e.g. QPainter::drawText under
Valgrind, it would produce "Conditional jump or move depends on
uninitialized value(s)" warnings, since we were allocating a buffer for
a FreeType bitmap without initializing its contents. FreeType,
apparently, does not set the value of all bytes in a bitmap buffer when
it is used as a FT_Bitmap, so we were left with some uninitialized
memory which was still being used.

This commit fixes these warnings, and prevents any potential undefined
behavior.

[ChangeLog][QtGui][General] fixed use of uninitialized memory in the
FreeType font engine

Change-Id: Ia7b3595c78310ce41f76cb4546fc36016c0000a8
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Adjust the layout if a QGraphicsWidget is explicitly hidden

Since layout items can now be hidden, this also makes sure we respect
the QSizePolicy::retainSizeWhenHidden

Task-number: QTBUG-20132
Change-Id: Iab59fc9b61d4ca1bb2208c479a027da6eb0283a9
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Run VS custom build step in new environment variable scope.

Task-number: QTBUG-32366
Change-Id: I99161b23e3d323fd88766ebe83c8bbfc1d50944e
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Q{Sequential,Associative}Iterable: fix const_iterator assignment

The code didn't properly clean up the current state before
assigning the new state.

Change-Id: If56cf43bace976203ff186759b2a81705b2b22d2
Reviewed-by: Stephen Kelly <steveire@gmail.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
Fix styled vertical dockwidget title cut off bug and elide text if long

Change common stylesheet to elide text correctly for both direction.

Change-Id: I045f6f74733ca8fa67b3e4fbb9d3845a1bea777d
Task-number: QTBUG-41466
Reviewed-by: Jens Bache-Wiig <jensbw@gmail.com>
Allow QtCreator to pass additional args and env vars to the application.

We need them to allow developers to easily pass args and env. vars like
QSG_RENDER_TIMINGS, QSG_VISUALIZE to theirs apps.
The env vars and params must be base64 encoded!

Change-Id: I1d781873ffdc6efd40b30543a9fd2514bbdede43
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>