Some improvements

client/lib/avatar.coffee

@@ -6,6 +6,8 @@
 
 	return "#{Meteor.absoluteUrl()}avatar/#{username}.jpg?_dc=#{random}"
 
+Blaze.registerHelper 'avatarUrlFromUsername', getAvatarUrlFromUsername
+
 @updateAvatarOfUsername = (username) ->
 	key = "avatar_random_#{username}"
 	Session.set key, Math.round(Math.random() * 1000)

client/stylesheets/base.less

@@ -2156,18 +2156,28 @@ a.github-fork {
 	}
 	.popup-item {
 		padding: 8px 20px;
+		line-height: 24px;
+		cursor: pointer;
+		user-select: none;
 		color: @secondary-font-color;
 		&.selected {
 			background-color: @tertiary-background-color;
 			color: @primary-font-color;
 		}
 	}
+	.popup-user-avatar {
+		width: 24px;
+		display: inline-block;
+		height: 24px;
+		background-size: contain;
+		border-radius: 3px;
+		margin: -7px 4px;
+	}
 	.popup-user-status {
 		border: 1px solid rgba(0,0,0,.2);
 		width: 10px;
 		height: 10px;
 		display: inline-block;
-		margin-right: 5px;
 		border-radius: 10px;
 	}
 	.popup-user-status-system {

client/views/app/messagePopupConfig.coffee

@@ -12,16 +12,17 @@ Template.messagePopupConfig.helpers
 			getFilter: (collection, filter) ->
 				exp = new RegExp(filter, 'i')
 				Meteor.subscribe('onlineUsers', filter)
-				items = onlineUsers.find().fetch()
+				items = onlineUsers.find({$or: [{name: exp}, {username: exp}]}, {limit: 5}).fetch()
 
 				all =
 					_id: '@all'
 					username: '@all'
-					status: 'system'
+					system: true
 					name: t 'Notify_all_in_this_room'
 					compatibility: 'channel group'
 
-				if exp.test(all.username) or exp.test(all.name) or exp.test(all.compatibility)
+				exp = new RegExp("(^|\\s)#{filter}", 'i')
+				if exp.test(all.username) or exp.test(all.compatibility)
 					items.unshift all
 
 				return items

client/views/app/messagePopupUser.html

 <template name="messagePopupUser">
-	<div class="popup-user-status popup-user-status-{{status}}"></div><strong>{{username}}</strong> {{name}}
+	{{#unless system}}
+		<div class="popup-user-status popup-user-status-{{status}}"></div>
+		<div class="popup-user-avatar" style="background-image:url({{avatarUrlFromUsername username}});"></div>
+	{{/unless}}
+	<strong>{{username}}</strong> {{name}}
 </template>
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