Windows/QQC2 Menubar - expanded menus has changed position from left to right

Previous application compiled with Qt 5.9.2 showed the menu in the menubar as "normal", i.e. when expanded the left edge of the menu were anchored to the left of the menu header.

When compiled in Qt 5.10.0, this has changed. The right edge of the expanded menu is now anchored to the right edge of the menu header.

I have attached an image and a test case.