I can duplicate this on Windows. With Preview undocked, scroll a chapter by dragging the scrollbar button (holding the left mouse-button down) and then move the mouse off of the Preview window and release the button.
It behaves as if the mouse-button is still held down, and the window will scroll whenever the mouse crosses the Preview scrollbar. This continues until the scroll-button is clicked again with mouse over it.
The same does not happen when Preview is docked (nor does it happen with other undocked Sigil widgets).
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