--> Unassigning to reflect reality, since I'm not actively working on this & don't foresee having time to pick it up again soon. (Per comment 14, there's still arguably something to be fixed here for testcase 1 and testcase 3, so this isn't fixed, but it's also not high priority. If anyone else picks this up, https://phabricator.services.mozilla.com/D35628 has my first attempt at a fix & some automated testcases that may be useful -- but as jfkthame pointed out in phabricator, it broke some Mac widget stuff.)
Bug 1560824 Comment 15 Edit History
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--> Unassigning to reflect reality, since I'm not actively working on this & don't foresee having time to pick it up again soon. (Per comment 14, there's still arguably something to be fixed here for testcase 1 and testcase 3, so this isn't fixed, but it's also not high priority. If anyone else picks this up, https://phabricator.services.mozilla.com/D35628 has my first attempt at a fix & some automated testcases that may be useful -- but as jfkthame pointed out in phabricator, that patch breaks some Mac widget stuff, which is why it didn't land.)