I don't know if any native theme objects are doing that. Scrollbars are a little weird - nsGfxScrollFrame hides scrollbars (for overflow:auto) by forcing their width or height to zero, which we then *have to* honor at all times throughout reflow and paint or we get these display errors and/or assertions.
I don't know if any native theme objects are doing that. Scrollbars are a little weird - nsGfxScrollFrame hides scrollbars (for overflow:auto) by forcing their width or height to zero, which we then *have to* honor at all times throughout reflow and paint or we get these display errors and/or assertions.