It is just unexpected and confusing when it isn't.
There's something weird about the cursor position when scrolling it out of view;
it will be shown clamped to the visible area of the view (as if it had moved in
the opposite direction than the scroll direction), but then when you type
something again, or just move the cursor with the arrow keys, the view will jump
back to where the cursor really was. This looks confusing, and it might be
reason enough not to allow scrolling the view at all.
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