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This edge case happens when: - we have a display item A nested inside another display item B - B has pushed an out-of-band clip, and - A's clip chain doesn't connect directly to the end of B's clip chain but instead connects somewhere farther up the clip chain See comments in the patch for more details. MozReview-Commit-ID: 4mCCaVUQuvH --HG-- extra : rebase_source : 1601a8f0c586d618d395b4e20086b9ecd318945b