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nsImageGeometryMixin is used to redraw images with sync decoding. Without it, if we paint an image with non-sync decoding, we won't know that it will be drawn differently with sync decoding and so don't have a mechanism to include it in the invalid region. Currently the main situation where we draw images with non-sync decoding and then with sync decoding is during reftests. If we unconditionally use sync decoding during reftests we don't have to worry about the situation where we switch. This will let us resolve the problems associated with nsImageGeometryMixin. Differential Revision: https://phabricator.services.mozilla.com/D149657
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