GNOME Bugzilla – Bug 99674
scrollbars look funny if they are supposed to be resized to infinite
Last modified: 2004-12-22 21:47:04 UTC
When the adjustment of the scrollbar is like: Adjustment->lower = 0; Adjustment->upper = 0; Adjustment->page_size = 0; Adjustment->page_increment = 0; Adjustment->step_increment = 0; The bottom of the scrollbar will be cut in half and there's some sort of obvious rendering problem.
Created attachment 12585 [details] a test case
You test case has upper==lower==0 , page_size==1 which is completely nonsensical, since the range of values for a scorllbar is lower to upper - page_size. So, you have a scrollbar where the maximum value is less then minimum value.