[Interest] strange behaviour of QRegion::contains(QRect)

[Manner Róbert]

Hi,

Works, as it is documented, but I think QRegion::contains(QRect) is a
bit confusing. Example:

  QRect bigRect(0, 0, 10, 10);

  QRegion smallRegion;
  smallRegion += QRect(0, 0, 1, 1);

  smallRegion.contains(bigRect.bottomRight())  --> returns false of
course, bigRect is bigger

  smallRegion.contains(bigRect)  --> returns true ???

The reason is, according to the documentation, it is true if the region
"overlaps" the rectangle. So in this case contains does not mean
containment, but intersection.

For this use case, QRegion already has an intersects() function which
does what it says. I think the contains function should be deprecated
and removed, or, it should behave according to its name (eg return
this->substracted(rect).isEmpty()).

Robert