Fixed tooltip and migration.

packages/rocketchat-ui-master/master/main.coffee

@@ -250,14 +250,14 @@ Template.main.onRendered ->
 
 	$(window).on('mouseleave', (e) ->
 		elem = $(e.fromElement)
-		avatarElem = elem.find('a.thumb')
+		avatarElem = elem.find('button.thumb')
 		if avatarElem.attr('data-username')
 			RocketChat.tooltip.hide();
 	)
 
 	$(window).on('mouseenter', (e) ->
 		elem = $(e.fromElement)
-		avatarElem = elem.find('a.thumb')
+		avatarElem = elem.find('button.thumb')
 		username = avatarElem.attr('data-username')
 		if username
 			e.stopPropagation()

server/startup/migrations/v054.js

 RocketChat.Migrations.add({
-	version: 51,
+	version: 54,
 	up: function() {
-		// Set default message viewMode to 'normal' or 'cozy' depending on the users' current settings and remove the field 'compactView'
-		var normalViewUserIds = [],
-			cozyViewUserIds = [];
-		RocketChat.models.Users.find().forEach(
-			function(user) {
-				if (user.settings && user.settings.preferences && user.settings.preferences.compactView) {
-					cozyViewUserIds.push(user._id);
-				} else {
-					normalViewUserIds.push(user._id);
-				}
-			}
-		);
-
-		RocketChat.models.Users.update({_id: {$in: normalViewUserIds}}, {$set: {'settings.preferences.viewMode': 0}});
-		RocketChat.models.Users.update({_id: {$in: cozyViewUserIds}}, {$set: {'settings.preferences.viewMode': 1}});
-		RocketChat.models.Users.update({}, {$unset: {'settings.preferences.compactView': ''}}, {multi: true});
+		if (RocketChat && RocketChat.models && RocketChat.models.Users) {
+			// Set default message viewMode to 'normal' or 'cozy' depending on the users' current settings and remove the field 'compactView'
+			RocketChat.models.Users.update({ 'settings.preferences.compactView': true }, { $set: { 'settings.preferences.viewMode': 1 }, $unset: { 'settings.preferences.compactView': 1 } }, { multi: true });
+			RocketChat.models.Users.update({ 'settings.preferences.viewMode': { $ne: 1 } }, { $set: { 'settings.preferences.viewMode': 0 } }, { multi: true });
+		}
 	}
 });