fix(panel): fixed panel help tooltip issue, #4079

public/app/features/panel/panel_directive.ts

@@ -144,7 +144,7 @@ module.directive('grafanaPanel', function($rootScope) {
 
       function updatePanelCornerInfo() {
         var cornerMode = ctrl.getInfoMode();
-        cornerInfoElem[0].className = 'panel-info-corner + panel-info-corner--' + cornerMode;
+        cornerInfoElem[0].className = 'panel-info-corner panel-info-corner--' + cornerMode;
 
         if (cornerMode) {
           if (infoDrop) {

tasks/default_task.js

@@ -9,7 +9,7 @@ module.exports = function(grunt) {
     'concat:cssFonts',
     'styleguide',
     'sasslint',
-    'postcss'
+    'postcss',
     ]
   );
 

tasks/options/cssmin.js

@@ -1,5 +1,8 @@
 module.exports = function(config) {
   return {
+    options: {
+      restructuring: false,
+    },
     build: {
       expand: true,
       cwd: '<%= genDir %>',