Weird behavior on key press and mouse movement at the same time

[busybox11]

Since I can't describe every situation, i'm going to sum up what I've seen so far for this bug.

First off. When you're moving around the mouse cursor pretty fast AND pressing certains keys at the same time, the mouse cursor will move significantly faster and / or "teleport" (I'm not sure about what it exactly does, but basically the cursor is not behaving as it should).
Also, when pressing multiple keys at the same time AS LONG AS moving the mouse cursor, it'll behave just like with one key, but worse (like, going to an edge of the screen).

[sleepy-monax]

This seems to be a bug in the interrupt dispatching code.