Hi,

So here is a patch that I think fixes the calculation of the menu bar
entry to activate from the mouse click in menu bar with the no toolkit
build.

Issue: Before this patch, if you change the font of the menu face (for
instance with (set-face-font 'menu "SomeOtherFontOfDifferentSize")), a
click in the menu bar won't activate the correct entry.

What is not in this patch: The height of the menu bar is not
recalculated correctly.