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The issue here is caused (a bit surprisingly) by the counter-reset declaration. The underlying issue is that counter-reset causes us to rebuild the frame tree for the whole `<body>`, in order to rebuild the counter tree. That makes the geometry frame not get its updated style (because the frame goes away), and the next frame getting constructed getting a null aOldComputedStyle (as expected, as it's a new frame). We can't rely on the cached path not to change while there's no frame, so clear it out when there's no old style. The test is a simpler version of the test-case, where instead of `counter-reset`, I use `display: none` to trigger the bogus codepath. Differential Revision: https://phabricator.services.mozilla.com/D100237
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