fix: Invalidate permissions cache if group assignment of user changes #7963
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Description
This PR fixes #7962.
When the user is assigned or unassigned from a group, not the
pre_save
signal is fired but them2m_changed
signal. This, up to now, has not been caught by django CMS.This PR adds a receiver for the
m2m_changed
signal and invalidates the permissions cache for the user.Both adding a group to a user or removing a group to a user are tested.
Related resources
Checklist
develop-4