[Gecko Bug 1708303] Fix scroll-margin implementation. #28856
Merged
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So that margin is not included in the rect for visibility calculations,
and padding and margin are accounted properly on them.
Differential Revision: https://phabricator.services.mozilla.com/D113853
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1708303
gecko-commit: 8befa6dc66fd8dd3f591cd5d97d3dc79ab831ab5
gecko-reviewers: hiro