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I use several Project Groups to keep some groups and their files opened, so in 8.0 when I switched to another Project Group, the tab order was restored for each project of the group. In 8.1, when I switch Project Group, it's always reseted to I don't know which order, but not mine. Note that closing the IDE and then re-opening it restores the tabs in the right order, it only affects Project Group switching.
8.2, it still happens