Documentation of QMenuBar::actionGeometry is missing.

It should be documented. There are probably some issues related to nativeMenuBar property, at least.

If the method should not be used, it should perhaps be renamed, and current name documented as deprecated, and alternative approach described.

Now naming indicates it's analogous with QMenu::actionGeometry, and there is existing code that uses it, and documentation of Qt for other languages mention it, presumably due to automatic document generation.