Add json/savegame example.

There wasn't any example documentation besides json.html, which doesn't
actually describe usage of the various QJson* classes.

This also makes each QJson* class page link back to json.html.

Change-Id: If5ad6493d2728df0cec7bdbbc5790f0b755f816c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Fix scrollbar appearance on Win8

Task-number: QTBUG-26503
Change-Id: Id74821e005483d05450467fcaea672bbf35113bc
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Cocoa: Bring back old exposure behavior on Mac OS X 10.6

Task-number: QTBUG-31864
Change-Id: Ife2429b2d6b845e5ccca31a03e66351a3ff5ba4b
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Style: Remove useless background paint for menu scroller

This would also cause an extra paint in QQuickStyleItem, resulting
in the frame being erased for those styles not having a frame width
set (e.g., fusion and GTK).

Change-Id: I7a9371c540cd31fd9f1400a51c4ec57582996dd2
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Cocoa: Fix memory leak in event dispatcher

We retain each modal NSWindow as long as its modal session is running,
and we should release it every time that modal session ends.

Task-number: QTBUG-32728
Change-Id: Ia30c9c2d15be1350e7150a0d3c2f530a2fe4f38b
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Add more comparisons to narrow down error case.

Task-number: QTBUG-32927

Change-Id: I83d6def83c37febd8cd83676bff9d74f364ecfad
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Simo Fält <simo.falt@digia.com>