If you have been typing in a text area and pan away somewhere else, continuing to type results in the view port being dragged part of the way back to the active text area with the first key stroke and the rest of the way on the second.

Typing into an off-screen text area is almost always a mistake for me and usually results in a text area that is now empty except for a Space, V, T or A character from my most common keyboard shortcuts. I'd prefer if it just registered that I probably didn't want to type into an off-screen text area and took my input as a keyboard shortcut.