fix(select): disabled option no longer reacting to hover and closing on click

Added a not disabled check before closing menu,
Now when clicking the menu anywhere but a valid option the menu closing will be prevented

fixes #4967

Author: EladBezalel

src/components/select/select-theme.scss

@@ -64,7 +64,7 @@ md-select-menu.md-THEME_NAME-theme {
       }
     }
   }
-  md-option:focus:not([selected]) {
+  md-option:focus:not([disabled]):not([selected]) {
     background: '{{background-200}}';
   }
 

src/components/select/select.js

@@ -1199,14 +1199,16 @@ function SelectProvider($$interimElementProvider) {
           if (ev && ( ev.type == 'mouseup') && (ev.currentTarget != dropDown[0])) return;
           if ( mouseOnScrollbar() ) return;
 
-          if (!selectCtrl.isMultiple) {
-            opts.restoreFocus = true;
+          var option = $mdUtil.getClosest(ev.target, 'md-option');
+          if (option && option.hasAttribute && !option.hasAttribute('disabled')) {
+            if (!selectCtrl.isMultiple) {
+              opts.restoreFocus = true;
 
-            $mdUtil.nextTick(function() {
-              $mdSelect.hide(selectCtrl.ngModel.$viewValue);
-            }, true);
+              $mdUtil.nextTick(function () {
+                $mdSelect.hide(selectCtrl.ngModel.$viewValue);
+              }, true);
+            }
           }
-
           /**
            * check if the mouseup event was on a scrollbar
            */