Oof, that looks pretty rough. This seems like either a panel or widget bug. I'm going to put this in Widget:GTK right now (since it looks like you're using Linux).
Bug 1655585 Comment 1 Edit History
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Oof, that looks pretty rough. This seems like either a panel, graphics or widget bug. I'm going to put this in Widget:GTK right now (since it looks like you're using Linux).