QGroupBox: Exclude top level widgets from child event handling.

Prevent the QGroupBox from changing the enabled state of
dialogs parented on it.

Task-number: QTBUG-40132
Change-Id: I91cc6ccf5ade0b3a491020ed947d4aceca62d7b6
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
QDebug: Add resetFormat()

Similar to QTextStream::reset(), this resets the stream format to the
defaults. Its primary use is inside custom operator<< implementations,
where you'd want to have a fixed format regardless of the current
stream state.

Change-Id: I421d76c61f164579bb90cf4195cc5376e2dcf0f3
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
windows: Fix ANGLE function resolution in static builds

The EGL/GLES functions are now resolved statically when needed.

Task-number: QTBUG-40199
Change-Id: I58c675b1c410708237475e1e5d6609ca7d6713f1
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>