fix(autocomplete): keyboard input used by autocomplete will now call

`$event.stopPropagation()` to prevent the event from bubbling up

Closes #2931

Author: Robert Messerle

src/components/autocomplete/autocomplete.spec.js

@@ -55,8 +55,8 @@ describe('<md-autocomplete>', function() {
       expect(scope.match(scope.searchText).length).toBe(1);
       expect(ul.find('li').length).toBe(1);
 
-      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.DOWN_ARROW, preventDefault: angular.noop });
-      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.ENTER, preventDefault: angular.noop });
+      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.DOWN_ARROW, stopPropagation: angular.noop });
+      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.ENTER, stopPropagation: angular.noop });
       scope.$apply();
       $timeout.flush();
 
@@ -95,8 +95,8 @@ describe('<md-autocomplete>', function() {
       expect(scope.match(scope.searchText).length).toBe(1);
       expect(ul.find('li').length).toBe(1);
 
-      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.DOWN_ARROW, preventDefault: angular.noop });
-      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.ENTER, preventDefault: angular.noop });
+      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.DOWN_ARROW, stopPropagation: angular.noop });
+      ctrl.keydown({ keyCode: $mdConstant.KEY_CODE.ENTER, stopPropagation: angular.noop });
       scope.$apply();
       $timeout.flush();
 

src/components/autocomplete/js/autocompleteController.js

@@ -347,25 +347,26 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
     switch (event.keyCode) {
       case $mdConstant.KEY_CODE.DOWN_ARROW:
         if (ctrl.loading) return;
-        event.preventDefault();
+        event.stopPropagation();
         ctrl.index = Math.min(ctrl.index + 1, ctrl.matches.length - 1);
         updateScroll();
         updateMessages();
         break;
       case $mdConstant.KEY_CODE.UP_ARROW:
         if (ctrl.loading) return;
-        event.preventDefault();
+        event.stopPropagation();
         ctrl.index = ctrl.index < 0 ? ctrl.matches.length - 1 : Math.max(0, ctrl.index - 1);
         updateScroll();
         updateMessages();
         break;
       case $mdConstant.KEY_CODE.TAB:
       case $mdConstant.KEY_CODE.ENTER:
         if (ctrl.hidden || ctrl.loading || ctrl.index < 0 || ctrl.matches.length < 1) return;
-        event.preventDefault();
+        event.stopPropagation();
         select(ctrl.index);
         break;
       case $mdConstant.KEY_CODE.ESCAPE:
+        event.stopPropagation();
         ctrl.matches = [];
         ctrl.hidden = true;
         ctrl.index = getDefaultIndex();