This is a native look and feel issue. On w32 apps, the scrollbar always gets a focus highlight when the mouse hovers over it. We emulate this with the XUL scrollbar, but after a drag event, the highlight disappears until the mouse is moved again. STR: 1. move mouse over a scroll bar (notice highlight effect) 2. drag scrollbar Actual : after mouseUp from drag, scroll bar highlight is gone Expected : highlight to persist after mouseUp from the drag
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