Alacritty: DPI/scaling cannot be changed dynamically/without restart.

[frebib]

Running latest HEAD at time of writing, X11 on Linux.

I work a lot both docked and undocked, and depending on where I am I adjust the DPI of my display to suit. Using xsettingsd and my handy DPI script for adjusting X11 DPI on the fly, I can get on just fine. Many (GTK-based) applications, including other vte based terminal emulators, implement the xsettings protocol and change their DPI when asked to.

I can't seem to work out how to get Alacritty to change the scale/dpi without restarting each terminal instance. I'd like to be able to replicate the same "change dpi at will" functionality as I can with most other windows.

[chrisduerr]

Reported upstream in https://github.com/rust-windowing/winit/issues/1228.