Shell-based swallowing doesn't always work correctly in Alacritty

[SeerLite]

Conversation started here

Happens when the shell init is sourced quickly, before the terminal window has appeared: xdo id won't catch the terminal as it doesn't exist yet.

This could be worked around when/if #2817 on Alacritty gets implemented. For now, the best way to go is to fall back to the terminal pid based approach (i.e. not adding setup lines to .bashrc/.zshrc/shell init).