The Bug:
I've been noticing lately that the cursor in Pico-8's code editor sometimes will get "stuck." It will suddenly start moving continuously to either the start or end of the current line, and even if I try to move the cursor it will just move itself directly back. Holding down the arrow key opposing the direction it's moving in will make it stay in place, a character away from the start/end of the line. For whatever reason, this never makes the cursor change lines, so it doesn't appear to be something as simple as a single input getting repeated unnecessarily. It also affects the cursor command line.

The Cause:
This bug does not appear to have a consistent cause that I can identify, though I think it most often happens when I'm hitting multiple keys at once.

Solutions:
As far as I'm aware, the only way to restore normal functioning is to closing and re-opening Pico-8.

Have other people have encountered this? Does anyone know of any other solutions to this issue?
(I'm using 0.1.11D, but it happened with earlier versions too.)

I've seen this come up before. It can happen during games too, I think?

If you press the button that seems to be 'held' though, it returns to normal. So I'm guessing it's a situation where there's a SDL keyup event that isn't processed.

Also, here is another bug: sometimes, my pico-8 switches to some strange mode (i don't even need to press anything, and I don't get a notification in that red box), where you can't use z and x chars, when you try to type them, your mouse works, and nothing is being typed. Super annoying, happened to me quite a few times, even in v0.1.11