When I maximize the Emacs frame, it uses the full width of the screen, no background showing. But if I e.g. snap-to-edge (in XFCE), it shows a little "margin" of background outside the frame. And if I drag to resize, it always over- or undershoots the edge – it looks like it wants to always resize by whole lines/characters. Is there a way to have a 50% size Emacs frame that aligns with the edge of the screen?
(I'm using 20170203:93058-ce88155-emacs-25.1~ubuntu16.04.1)
When I "snap" Emacs to the edges with XFCE, it fits the width on my laptop, but not on my external monitor. It never matches the full height.