[Gecko Bug 1673885] Don't expose incomplete sheets in LinkStyle.sheet / Document.styleSheets. #26379
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This matches other browsers, and common sense to some extent.
The code is a bit awkward because I want this behind a pref for now, as
it's not precisely a zero-risk change.
Differential Revision: https://phabricator.services.mozilla.com/D95065
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1673885
gecko-commit: 3e671ccc31d5afdeac284176d24fcbaff3fdc4bf
gecko-reviewers: nordzilla