Not a bug Move Thread Overlay Height

The "acceptable" level is a bit more than just the 400px from overlayScroll, as there are potentially some situations where there may be parts outside the scrolled area. This overlay comes out as about 490px by default, so I don't think it explicitly trips the level of needing a scroll.

That said, I have added another tweak that selects fixed/absolute based on the height of the window as well as other elements.
 
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