[css-transition] Add an explicit style flush before changing a style. #28164
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If the target transition element hasn't been styled, the new style change will never be an after-change style, which mean the transition will never be triggered. Without this change, this test is very flaky on Firefox. See https://bugzilla.mozilla.org/show_bug.cgi?id=1698486.
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If the target transition element hasn't been styled, the new style change
will never be an after-change style, which mean the transition will
never be triggered.
Without this change, this test is very flaky on Firefox. See
https://bugzilla.mozilla.org/show_bug.cgi?id=1698486.