Fixes #3639 - Mention widget show same users several times (if rest requests will return in different order).
Fixes #3639 - Mention widget show same users several times (if rest requests will return in different order).

zammad/zammad,zammad/zammad,monotek/zammad,monotek/zammad,monotek/zammad,monotek/zammad,zammad/zammad,zammad/zammad,monotek/zammad,zammad/zammad,monotek/zammad,zammad/zammad