Repro:

• fire up PICO-8
• switch to code editor
• type something like 123456789 and hit enter
• copy and paste that line few times to give yourself something to cursor through
• using the keyboard, navigate to the middle of one of these lines
• cursor up and down: should work normally
• click near the start or end of the line
• cursor up or down: will change the row properly but maintain the column from before the click

Demo:

This is probably as easy to fix as just setting both the current and virtual column on mouse clicks.

+1, I'm witnessing this too in my current code.

Fixed for 0.1.12d 👍

Yay! :)