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Description of problem:
When there is large amounts of users in user-list on GDM login screen should be just 5 (most used) of them but if there is more than 1000 users in on login there is list without scroll bar and its impossible to choose some user from list. 

Version-Release number of selected component (if applicable):
gnome-shell-3.8.4-45.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Launch a terminal.
2.execute "for i in $(seq 1001); do useradd -p xxx test$i; done " in terminal.
3. logout
4. look on user-list

Actual results:
user list without scrollbar or other way how to choose user

Expected results:
5 most used users in list

Additional info:

This worked in RHEL 7.0 .. there was a scrollable list produced at the login screen.

We have 100+ users defined in /etc/passwd, and a list of names is presented on the initial login screen.  However, it's impossible to scroll up or down in this user list to select the desired user.  The middle mouse button seems to be disabled, so scrolling has become impossible!  One can use the left and right mouse buttons to select one of the users in view, but no one else. 

This seems definitely to be a critical bug in 7.1. In 7.0 there was no problem.

I pushed an updated gnome-shell-3.14.4-16.el7 build that should address this issue.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2216.html