improve restricted movement calculations

Review Request #125428 - Created Sept. 27, 2015 and submitted

Information
Thomas Lübking
kwin
master
Reviewers
kwin
graesslin
* skip all overhead on unrestricted moveResizes
* the titlebar is not guaranteed to be the top border (anymore)
* don't block vertical resize when resizing on a top corner
* reduce QRegion operations by knowledge about the degenerated titlebarregion (rect)
* rename int (sic!) titleArea to requiredPixels

This is https://git.reviewboard.kde.org/r/113123/ minus deco query overhead (already applied/changed) plus some lambdas ;-)

  
Martin Flöser
Thomas Lübking
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit d61e6cd4458609c30826a2b14682dad2908133dd by Thomas Lübking to branch master.
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