[Gecko Bug 1799216] Keep clip chain id in sync when switching items that affect clip positioning. #36837
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Bug 1661147 made us correctly inherit the clip chain. We do fix up the
scroll id etc before pushing a new ASR override etc, but we didn't fix
up the clip chain ID.
Differential Revision: https://phabricator.services.mozilla.com/D161382
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1799216
gecko-commit: 2d53a4acaad28c95bc1a19d05b379bf25f850be0
gecko-reviewers: gfx-reviewers, gw