Fix gray SpinBox background on mac

This is a regression caused by removing the fillrect for SpinBoxStyle
itself.

Change-Id: Ibab509634a12aec591d2d031a0e735d602b388c6
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Fix some typos

Change-Id: Ic2e2060b57b0d74e96d6aad0ceff4679d986a26c
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>