[Gecko Bug 1611848] Properly suppress shadow dom / display: contents inside svg text. #22467
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Returning null from FindSVGData just means "fall back to whatever display
specifies", and that's not great.
Differential Revision: https://phabricator.services.mozilla.com/D67706
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1611848
gecko-commit: 02c284defc4d5f8d9ed1c7c8363becdd93f4b291
gecko-integration-branch: autoland
gecko-reviewers: heycam