Part 2 of 2 was backed out for causing test fails here: https://treeherder.mozilla.org/jobs?repo=comm-central&collapsedPushes=1593425&selectedTaskRun=YkoJtHmGTfO_vsPsAMRWfQ.0
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Part 2 of 2 was backed out for causing test fails in `mailnews/base/test/unit/test_folderCompact.js`: https://treeherder.mozilla.org/jobs?repo=comm-central&collapsedPushes=1593425&selectedTaskRun=YkoJtHmGTfO_vsPsAMRWfQ.0