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When you close a project (especially from the groups tab) it should also be removed from the group, or atleast no longer visible in the group.
There is already a "Remove from Group" action in the Groups tab. You may, for example, want to open a whole group of projects which are related but then close a few that you don't need to deal with today - it would be annoying if this also modified the group definition. However other enhancements in this area will be considered. E.g. currently there is no action in the Projects tab to remove an (open) project from its group(s), which there probably should be. Also there is no visual indication in the Groups tab of which projects are open; probably open projects could be marked with a special icon badge, or the icon for closed projects could be greyed out, etc.
> Also there is no visual indication in the Groups > tab of which projects are open; probably open projects could be marked with a > special icon badge, or the icon for closed projects could be greyed out, etc. I understand better how groups work now... Yes the visual indication would be useful. Ontop of this if you right click on a project you can choose "Open All Projects". This should only open closed projects. Currently it opens again opened projects so you end up with duplicate projects in the project tab :-(
Re. "it opens again opened projects so you end up with duplicate projects in the project tab" - not for me it doesn't. If you know to reproduce from scratch please file a separate bug.
Cancelled. See issue #50683.