I can't reproduce this bug. Clicking "Restore column order" works for me.
Bug 1817867 Comment 1 Edit History
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~I can't reproduce this bug. Clicking "Restore column order" works for me.~ EDIT: Nevermind, I was able to reproduce it. This used to work since I implemented it, something regressed it recently. I'm also working on re-enabling the tests for this so we can hopefully avoid further breakages.