QWidget: Set screen on top-level windows only.

Change-Id: Iea7fbe253ff3144d9988fd14790296e211075d3b
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Refactor custom/standard color selectors in QColorDialog.

Introduce an enumeration for the rows/columns and
use std::find() to find the matching colors.

Change-Id: If8b7f76d48beab470f6cac0bfdeaf56058237e94
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Fix compilation of the manual dialog test with Qt 4.

Task-number: QTBUG-27186
Change-Id: I959c060930ad8a3fa6606be6df0562a96a18eac7
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>