fix(typeahead): reset 'parse' validation key

When typeahead-editable="false" and we select a perfect
match from the results list, the $parsers aren't called,
which results in the 'parse' error key not being reset.

As with the 'editable' key, we should reset this once
an item is selected because we know we have a valid
model matching the view value.

Closes #3166

src/typeahead/test/typeahead.spec.js

@@ -675,6 +675,16 @@ describe('typeahead tests', function () {
       expect($scope.result).toEqual('manually set');
       expect($scope.form.input.$valid).toBeTruthy();
     });
+
+    it('issue #3166 - should set \'parse\' key as valid when selecting a perfect match and not editable', function () {
+      var element = prepareInputEl('<div ng-form="test"><input name="typeahead" ng-model="result" typeahead="state as state.name for state in states | filter:$viewValue" typeahead-editable="false"></div>');
+      var inputEl = findInput(element);
+
+      changeInputValueTo(element, 'Alaska');
+      triggerKeyDown(element, 13);
+
+      expect($scope.test.typeahead.$error.parse).toBeUndefined();
+    });
   });
 
   describe('input formatting', function () {

src/typeahead/typeahead.js

@@ -259,6 +259,7 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.position', 'ui.bootstrap
         model = parserResult.modelMapper(originalScope, locals);
         $setModelValue(originalScope, model);
         modelCtrl.$setValidity('editable', true);
+        modelCtrl.$setValidity('parse', true);
 
         onSelectCallback(originalScope, {
           $item: item,
@@ -333,7 +334,7 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.position', 'ui.bootstrap
       });
 
       var $popup = $compile(popUpEl)(scope);
-      
+
       if (appendToBody) {
         $document.find('body').append($popup);
       } else {