Forgetting closed tabs before starting the test makes it fail with `"Invalid index: not in the closed tabs"`: https://treeherder.mozilla.org/jobs?repo=try&revision=dfd6af44da7835620aa1ea1c5d4b360bfc51ba18, which means a) we're proceeding before we can write the history change to the TabStateCache, or b) we're not even recording that there was a history change.
Bug 1713975 Comment 4 Edit History
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Forgetting closed tabs before starting the test makes it fail with `"Invalid index: not in the closed tabs"`: https://treeherder.mozilla.org/jobs?repo=try&revision=dfd6af44da7835620aa1ea1c5d4b360bfc51ba18, which means a) we're proceeding before we can write the history change to the TabStateCache, or b) we're not even recording that there was a history change in the listener.