fix(select): update labels

Closes angular#9025

Author: btford

src/ng/directive/select.js

@@ -415,6 +415,18 @@ var selectDirective = ['$compile', '$parse', function($compile,   $parse) {
         ctrl.$render = render;
 
         scope.$watchCollection(valuesFn, scheduleRendering);
+        scope.$watchCollection(function () {
+          var locals = {};
+          var values = valuesFn(scope);
+          var toDisplay = [];
+          if (values) {
+            forEach(values, function (value) {
+              locals[valueName] = value;
+              toDisplay.push(displayFn(scope, locals));
+            });
+          }
+          return toDisplay;
+        }, scheduleRendering);
 
         if (multiple) {
           scope.$watchCollection(function() { return ctrl.$modelValue; }, scheduleRendering);

test/ng/directive/selectSpec.js

@@ -871,6 +871,26 @@ describe('select', function() {
         expect(element.val()).toEqual('1');
       });
 
+      it('should update options in the DOM', function() {
+        compile(
+          '<select ng-model="selected" ng-options="item.id as item.name for item in values"></select>'
+        );
+
+        scope.$apply(function() {
+          scope.values = [{id: 10, name: 'A'}, {id: 20, name: 'B'}];
+          scope.selected = scope.values[0].id;
+        });
+
+        scope.$apply(function() {
+          scope.values[0].name = 'C';
+        });
+
+        var options = element.find('option');
+        expect(options.length).toEqual(2);
+        expect(sortedHtml(options[0])).toEqual('<option value="0">C</option>');
+        expect(sortedHtml(options[1])).toEqual('<option value="1">B</option>');
+      });
+
 
       it('should bind to object key', function() {
         createSelect({