through a uncommon situation i run into this bug.
if have a collabsed code folde and see only the first line of code from this collabes code part.
when i hit enter somewere in this line the collabsed fold is removed, but the vertical scrollbar is not changed.
with this you are not able to go down to the avail! code after screenend.
with the 2 screenshots i add you see the problem.