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80159f3cf5
When entering or leaving fullscreen in youtube, we spend most of the restyle time diffing custom properties, under IndexMap::eq. Turns out that IndexMap equality is not order-aware, and thus you actually need to make a hashmap lookup for each entry in the map, which is unnecessarily inefficient. Instead, just compare the iterators. See https://github.com/bluss/indexmap/issues/153. Differential Revision: https://phabricator.services.mozilla.com/D89434 |
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