Worst web UI crime seen today:
A box that contains a code section in monospace font. No line wrapping, but there's a horizontal scrollbar underneath.
As soon as the mouse hovers over the box, the scrollbar disappears, and the box is expanded to the right to show the full unwrapped line.
For some reason, mouse position detection is unclean, and in about half the time, the box expands even if the mouse hovers just over the scroll bar, leading to heavy flickering between the two states.
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