We should probably just dupe this to bug 792508; I think we
Bug 1725781 Comment 16 Edit History
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[edit: inadvertently submitted a partially-written comment] We might want to dupe this and bug 792508, since they're the same core issue (modulo comment 12). Whatever we do, testcase 3 here is a nice minimal testcase for whoever works on this to start with; and bug 792508 comment 2 - 3 has some analysis/thoughts from Mats 10 years ago, too.