Single project in multiple groups

Created by: ovanes

Just started to try out the new "Project Groups" feature and came across some unexpected behaviour.

• Created 2 projects and put project Project1 into GroupA. Than put Project2 in GroupB.
• Went to GroupB and added Project1 to it without any questions, warnings or errors.

Project1 was removed from GroupA.

I would really appreciate to have a single project in multiple groups, but if that is not possible an error or Yes|No question should be presented, if a previous project's group should be discarded.