Drop dead code

The QFontEngineMulti's `base` font engine always non-null.

Change-Id: I5092b66bc839a6a3216ffa0b0afe55a8b62be620
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Fix QFontCache::Key comparison for custom font fallbacks case

Just a C&P typo, of course we have to compare lists, not their sizes.

Change-Id: I40542035b87f5bb8d75207cb02c0826cc3a2a413
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Make QWindowsMultiFontEngine support deferred fallback families query

This finishes 800232e1d3ebfbac28d07014a3c646ea00fcf6ad, which encovered
a tricky issue in QFontEngineMultiQPA::createMultiFontEngine().

Task-number: QTBUG-37836
Change-Id: I6d432e09e755f5d9ded09752c4c092f4857ad224
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Send touch update events to widget if there is a gesture pending for it.

Otherwise, touch update/end events were ignored and the gestures
were never triggered (unless a native widget was used).

Task-number: QTBUG-37759

Change-Id: I4b0145ffe535065e1458164b67bc8d9e33a4af97
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>