[Gecko Bug 1490791] Make ShadowRoot stylesheet list work only when the shadow root is connected. #12979
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This avoids the issue of triggering stylesheet loads for disconnected stuff and
such, and is more consistent with Chrome and WebKit.
This is per the recent CSSWG resolution at
w3c/csswg-drafts#3096.
Differential Revision: https://phabricator.services.mozilla.com/D5699
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1490791
gecko-commit: 71f86120ca35d113a2462b2ffe68bc5accc813e4
gecko-integration-branch: autoland
gecko-reviewers: smaug