... so that you can click it on the screen edge in vertical mode on
the right side. The BarMenuBar was 1px too narrow and didn't take up
the last pixel of its parent BarView container and therefore wouldn't
open the menu on click on the last pixel.
MenuBar width is increased by 1px in all modes but you probably won't
be able to notice the difference in other modes.
NULL comparison style fix and floorf call to prevent non-integer width
are included.
Fixes#15813
Change-Id: Ic5ebef5a63846a397a55358a111e33987538c455
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2377
Reviewed-by: Axel Dörfler <[email protected]>