Fix potential BC break in QTabBar.

Move code from mouseDoubleClickEvent() to event().
Introduced by 252bad7c589e03d3e12df02354b00a84d8e3159a .

Task-number: QTBUG-34670
Change-Id: I98ed24f26977220cf03524cfe001524364473982
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Fix potential BC break in QColorDialog.

Replace newly reimplemented virtuals in
d928dbbc919f5f39af9ce5c69eb8e9ffa9da71d3 .

Task-number: QTBUG-34663
Task-number: QTBUG-14332

Change-Id: Idb2cc2ec237c96f7157470728bb79ff3efc504d0
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Cocoa File Dialog: Remove sandbox-ufriendly file system watcher

QFileSystemWatcher causes sandboxing errors since its backend uses
POSIX API in a relatively liberal way.

Also, Cocoa already acts as a file system watcher, and calls
-[QNSOpenSavePanelDelegate panel:shouldShowFilename:] on each
file. From a logical point of view, caching the directory content
can be replaced by testing the current file against the filter
setting. We expect Cocoa to cache results, and by using NSFileManager
things should remain relatively fast.

Task-number: QTBUG-34107
Change-Id: Ia872b9b1244f7b390d173a498011379b9309b3c6
Reviewed-by: Cyril Oblikov <munknex@gmail.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>