On OSX (since a long time), scroll quickly in any direction using the wheel, 
then click in the window. Do it repeatedly. You will find that there is a high 
chance that some variable indicating the current state of the scrollbar and 
scrollable area is actually farther than was shown, as clicking in the window 
suddenly makes the whole screen jump to the new position, which may be only a 
few lines further than was shown, or more than a screenful, depends. It is not 
normal that the document be scrolled by just clicking in it (except at the very 
bottom if the last line is partially displayed, and then that special case only 
scrolls up by one line).

Sometimes while using the wheel, the scrollable area shows two different 
portions of the document in a kind of accidental split screen, but I can't tell 
whether this is a separate bug or the same bug.

This is a 3rd-party mouse with a traditional stepping wheel. I don't have a 
touch sensor mouse to compare with. But now I just tried with the laptop's 
trackpad and the same happens as with the mouse wheel, using regular two-finger 
drag. When using a fling gesture, however, after the first redraw of the 
screen, there's a pause until about 3/4 of a second after touch-up (the 
equivalent of button release), before suddenly a long series of screen updates 
happens, whereas normally screen updates should be equally-spaced during the 
gesture and the decelerating motion that continues for a while.

Compare what those 3 cases (wheel, 2-finger drag, 2-finger fling) do in other 
apps (e.g. I tried with Firefox OSX using a long enough web page.)

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