alacritty: Maximizing windows on macOS/X11 doesn't cover the whole screen

System

OS: macOS Version: f409f743724207e7a2a4c008ce74ea505ae6bbcf

To reproduce: hold option key and double click a corner of the window. It is supposed to maximize the window and cover the whole screen.

Notes:

• It only happens on my second monitor (3840 x 2160). It is not reproducible when I maximize a window in the built-in monitor.
• In my macOS setup, I auto hide the dock and notification bar.

I found this commit f409f743724207e7a2a4c008ce74ea505ae6bbcf introduces the problem using git bisect.

This is the screenshot with the decorations set to transparent decorations: buttonless decorations: full

Pay attention to the small gaps around the window.

This is the screenshot using 8a838710 with decorations: buttonless