I agree with the resolution, and I (almost) never use the built-in code editor.

Most of the time I have a folder per game, with a somegame.p8 whose only code is #include main.p8.lua (+ other includes if needed), and the code itself is inside main.p8.lua. Since the code is cleanly separated from the other assets, I don’t risk overwriting one with the other while juggling between my IDE and pico8