[Gecko Bug 1691397] Intrinsic sizes that depend on percentage-sized abspos ancestors should account for containing-block padding correctly. #27779
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Abspos boxes resolve against the pading box, and we were failing to
increase the percentage basis in that case if box-sizing was
content-box.
This is partially the cause of bug 1691374.
Differential Revision: https://phabricator.services.mozilla.com/D104389
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1691397
gecko-commit: 83d93b876225b37ec0a8afd837eeb939fc0e4ae3
gecko-reviewers: layout-reviewers, mats