fix(select): make ctrl.hasOption method consistent

Closes angular#8761

Author: btford

src/ng/directive/select.js

@@ -611,6 +611,7 @@ var selectDirective = ['$compile', '$parse', function($compile,   $parse) {
                     id: option.id,
                     selected: option.selected
                 });
+                selectCtrl.addOption(option.label, element);
                 if (lastElement) {
                   lastElement.after(element);
                 } else {
@@ -622,7 +623,9 @@ var selectDirective = ['$compile', '$parse', function($compile,   $parse) {
             // remove any excessive OPTIONs in a group
             index++; // increment since the existingOptions[0] is parent element not OPTION
             while(existingOptions.length > index) {
-              existingOptions.pop().element.remove();
+              option = existingOptions.pop();
+              selectCtrl.removeOption(option.label);
+              option.element.remove();
             }
           }
           // remove any excessive OPTGROUPs from select

test/ng/directive/selectSpec.js

@@ -378,6 +378,39 @@ describe('select', function() {
           expect(element).toEqualSelect(['? string:r2d2 ?']);
           expect(scope.robot).toBe('r2d2');
         });
+
+        describe('selectController.hasOption', function() {
+          it('should return true for options added via ngOptions', function() {
+            scope.robots = [
+              {key: 1, value: 'c3p0'},
+              {key: 2, value: 'r2d2'}
+            ];
+            scope.robot = 'r2d2';
+
+            compile('<select ng-model="robot" ' +
+                      'ng-options="item.key as item.value for item in robots">' +
+                    '</select>');
+
+            var selectCtrl = element.data().$selectController;
+
+            expect(selectCtrl.hasOption('c3p0')).toBe(true);
+            expect(selectCtrl.hasOption('r2d2')).toBe(true);
+
+            scope.$apply(function() {
+              scope.robots.pop();
+            });
+
+            expect(selectCtrl.hasOption('c3p0')).toBe(true);
+            expect(selectCtrl.hasOption('r2d2')).toBe(false);
+
+            scope.$apply(function() {
+              scope.robots.push({key: 2, value: 'r2d2'});
+            });
+
+            expect(selectCtrl.hasOption('c3p0')).toBe(true);
+            expect(selectCtrl.hasOption('r2d2')).toBe(true);
+          });
+        });
       });
     });
   });