Screen stutters for modern GPU acceleration based terminals like Alacritty, iTerm2, etc; use redraw with NOT_VALID

[poetaman]

Modern GPU based terminals draw the entire frame on redraws. The way to avoid screen from stuttering is to use a different approach to redrawing screen.

The solution is mentioned in neovim/neovim#14225 (comment), and vim/vim#8002 (comment). The solution is to redraw with
NOT_VALID, which would redraw everything but not clear the screen.

This problem is similar to vim on GPU accelerated terminals also has the problem and plans to fix it: vim/vim#8002

Here's an example of screen stuttering in peaclock (I am not pressing any keys in the video):

screensutter.mp4