If the line will get more than fits in the window the scrollbar moves, but when i delete lines again it won't move back until i click with the mouse pointer on the scrollbar.
WinSCP 5.20.4.RC and it is the same in 5.19.6.
Ctrl+End to move the cursor to the very end.
Enter several times to add empty lines so that the contents does not fit anymore. The original contents scroll out of the view and the vertical scroll bar appears.
Back several times to remove the empty lines. The scrollbar changes with every deleted line as expected.
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