fix(menu): prevents scrollbar from unnecessarily showing up on the body

Closes #3266

Author: Robert Messerle

src/core/util/util.js

@@ -107,6 +107,7 @@ angular.module('material.core')
       function disableBodyScroll() {
         var restoreStyle = body.getAttribute('style') || '';
         var scrollOffset = body.scrollTop + body.parentElement.scrollTop;
+        var clientWidth  = body.clientWidth;
 
         applyStyles(body, {
           position: 'fixed',
@@ -115,6 +116,8 @@ angular.module('material.core')
           top: -scrollOffset + 'px'
         });
 
+        if (body.clientWidth < clientWidth) applyStyles(body, { overflow: 'auto' });
+
         return function restoreScroll() {
           body.setAttribute('style', restoreStyle);
           body.scrollTop = scrollOffset;