Suggestion for QMdiArea::tileSubWindows() vertically or horizontally

QMdiArea::tileSubWindows() arranges all child windows in a tile pattern.
It will be nice if you offer the choice to
arrange them horizontally or vertically by adding the following two
public slots for instance:

void QMdiArea::tileSubWindowsVertically();
void QMdiArea::tileSubWindowsHorizontally();