Make scroll area with changing width keep its relative vertical scroll position

[Rusty-Cube]

I have a ScrollArea that contains a Grid with many rows. I'm using ScrollArea::show_rows to display it efficiently. However, the ScrollArea is inside a side panel, that I want to have dynamic width. If I resize the side panel, the scroll bar seems to keep its absolute scroll position and the content flies by. It would be much more useful, if it would keep its relative scroll position, so the content stays in place. How do I do that?

scroll_area_drift.mp4