Make it possible to assign/mention users from group members

app/controllers/projects_controller.rb

@@ -101,7 +101,7 @@ class ProjectsController < ProjectResourceController
     @suggestions = {
       emojis: Emoji.names,
       issues: @project.issues.select([:id, :title, :description]),
-      members: @project.users.select([:username, :name]).order(:username)
+      members: @project.team.members.sort_by(&:username).map { |user| { username: user.username, name: user.name } }
     }
 
     respond_to do |format|

app/views/merge_requests/_form.html.haml

@@ -40,12 +40,12 @@
             = f.label :assignee_id do
               %i.icon-user
               Assign to
-            .input= f.select(:assignee_id, @project.users.alphabetically.collect {|p| [ p.name, p.id ] }, { include_blank: "Select user" }, {class: 'chosen span3'})
+            .input= f.select(:assignee_id, @project.team.members.sort_by(&:name).map {|p| [ p.name, p.id ] }, { include_blank: "Select user" }, {class: 'chosen span3'})
           .left
             = f.label :milestone_id do
               %i.icon-time
               Milestone
-            .input= f.select(:milestone_id, @project.milestones.active.all.collect {|p| [ p.title, p.id ] }, { include_blank: "Select milestone" }, {class: 'chosen'})
+            .input= f.select(:milestone_id, @project.milestones.active.all.map {|p| [ p.title, p.id ] }, { include_blank: "Select milestone" }, {class: 'chosen'})
 
   .control-group