Re: Scrollbar bug on OS X

[Richard Stallman]

    Yes,and for Lesstif/Motif.  There has been bug reports on this 
    approach.  The main confusion seems to be that when a small buffer is 
    used (like the three initial lines in the *scratch* buffer), the 
    scrollbar thumb does not extend to the bottom, since we have added the 
    fictitious lines at the bottom.  The assumtion is that if you are 
    seeing the whole buffer, the scroll bar thumb should indicate that by 
    extending from top to bottom.

Yes, it is not perfect.  But all the alternatives have drawbacks.
This might be the best of all the possibilities.