[Mac El Capitan] MuseScore window won't enter menu bar space when menu bar is hidden

On the latest Mac operating system, there is an option to hide the global menu bar, and only show it when the cursor is moved to the top edge of the screen. The idea is that this allows windows to occupy that additional quarter inch of space. But for some reason, MuseScore is uniquely unwilling to occupy that space. Drag the window up to the top edge of the screen, and it snaps back down below where the menu bar would be.

See also #71416: Main window becomes tiny after being maximized.