fix(typeahead): remove popup flickering

Closes angular-ui#1011

Author: pkozlowski-opensource

src/typeahead/test/typeahead.spec.js

@@ -127,6 +127,9 @@ describe('typeahead tests', function () {
       var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source | filter:$viewValue'></div>");
       changeInputValueTo(element, 'ba');
       expect(element).toBeOpenWithActive(2, 0);
+
+      changeInputValueTo(element, '');
+      expect(element).toBeClosed();
     });
 
     it('should not open typeahead if input value smaller than a defined threshold', function () {

src/typeahead/typeahead.js

@@ -145,7 +145,6 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.position', 'ui.bootstrap
       //$parsers kick-in on all the changes coming from the view as well as manually triggered by $setViewValue
       modelCtrl.$parsers.unshift(function (inputValue) {
 
-        resetMatches();
         if (inputValue && inputValue.length >= minSearch) {
           if (waitTime > 0) {
             if (timeoutPromise) {
@@ -157,6 +156,8 @@ angular.module('ui.bootstrap.typeahead', ['ui.bootstrap.position', 'ui.bootstrap
           } else {
             getMatchesAsync(inputValue);
           }
+        } else {
+          resetMatches();
         }
 
         if (isEditable) {