apply_filters( 'manage_users_column' ) or equivalent no longer exists

[danielbachhuber]

For the Users WP_List_Table, apply_filters( 'manage_users_custom_column' ) still exists but there's no apply_filters( 'manage_users_column' ) or equivalent.

This used to be handled by get_column_headers(). The function was moved to screen.php where it's only applied if the columns aren't already set. For whatever reason, the columns are already set.

We should apply it when the columns are set too. Patch attached always applies the filters

Always apply the manage_*_columns filters

As it turns out, core does apply the filter once and I can no longer reproduce this issue that originally prompted this ticket. Closing as invalid.