Fix buglet in QGraphicsItem::stackBefore().

Reported by Alan. The stackBefore() implementation did not alter the
insertion order if the two items' current Z values were different. The
fix is to ensure it is updated, so that the stackBefore() operation
takes effect should the Z values become equal in the future. Example:

Current order: A-B-C-D
A->setZValue(1);
Current order: B-C-D-A (A moves to the end)
D->stackBefore(A);
Current order: B-C-D-A (unchanged, D is already before A)
A->setZValue(0);
Current order: D-A-B-C (now A moves back, and D moves in front)

Reviewed-by: Aaron Kennedy

0 files changed, 0 insertions, 0 deletions