Avoid breaking BC with new virtuals in QOpenGLPaintDevice

Task-number: QTBUG-41046
Change-Id: Iab628d2d6811d528e2cc513b6f8a74baa628541d
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
xcb: Don't return 0 as a possible key for a shortcut

QXcbKeyboard::keysymToQtKey() may return a value of 0 for keysyms
that are not supported by Qt (e.g. for XK_ISO_Next_Group).
It is then translated to an empty QKeySequence which in turn is
detected as a partial match for any shortcut.
The behavior of QShortcutMap::nextState() becomes broken because
it sets current state to QKeySequence::PartialMatch while there is
no match at all.

Task-number: QTCREATORBUG-9589
Change-Id: I1e2a4511a876dfa418db9906d10382255a2e4d62
Reviewed-by: Gatis Paeglis <gatis.paeglis@digia.com>
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reduce code duplication in QFontconfigDatabase

Extract common part from fontEngine() methods to setupFontEngine().

Change-Id: Id4aee43b2a477f9fd40dc564d96a2335bfde9e22
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>
Accessibility Linux: Make a full copy of a key event

Otherwise native values (scan code, modifiers, virtual key) of the key event
will be lost if an event listener is registered.

Change-Id: I5eebb1f91ad7de6801f7efb0bf0891c4430f9cf5
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>
xcb: Fix a type of variables for xkb modifiers masks

Change-Id: I05c7c6a649a55fc0648b1cb84e1c402160c9d998
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Gatis Paeglis <gatis.paeglis@digia.com>