Emilio Cobos Álvarez 8fb52356f4 Bug 1708303 - Fix scroll-margin implementation. r=hiro
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
2021-05-06 00:54:14 +00:00
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