[TYPO3-core] RFC:#1960: t3lib_BEfunc::blindUserNames() does not work sometimes

[Georg Ringer]

This is a SVN patch request.

Type: bugfix

Branches: trunk, 4.3, 4.2

Bugtracker references:
http://bugs.typo3.org/view.php?id=1960

Problem:
BE-User records got the field user_group_cached which holds all 
usergroups the user belongs to including subgroups and so on.

The problem is that this field does only get updated at one place: The 
BE-Module "User Admin" as you can see this by the message "(All cached 
group-lists updated.)"

Solution:
Add a new hook for tcemain which listens to changes in be_users and 
be_groups. If a be_user record is getting changed, the list of 
usergroups of this user is recalculated. If a be_groups record is 
getting changed, the list of usergroups of all users is recalculated as 
there is no other way to detect which users get effected by this change.

Additional information:
The field is e.g. used in the sysext "Log" and is also a very nice way 
for any developer to get the list of usergroups of a user without 
calulating it themselves.


regards
Georg from Bugauction at T3BOARD10 (even if this bug was not taken into 
account)
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