fix(ngTouch): don't prevent click event after a touchmove

Remove the touchmove handler so that resetState is not called on touchmove.
The touchend event handler already prevents the click from being triggered
if the distance moved exceeds the MOVE_TOLERANCE, so detection of touchmove
is not needed. Previously, because of resetState on touchmove, the click would
not be triggered even if the event coordinates changed by only 1px or 2px,
which seems to be very common for taps on mobile browsers.

Closes #10985

Author: mikec

src/ngTouch/directive/ngClick.js

@@ -66,7 +66,7 @@ ngTouch.directive('ngClick', ['$parse', '$timeout', '$rootElement',
   // double-tapping, and then fire a click event.
   //
   // This delay sucks and makes mobile apps feel unresponsive.
-  // So we detect touchstart, touchmove, touchcancel and touchend ourselves and determine when
+  // So we detect touchstart, touchcancel and touchend ourselves and determine when
   // the user has tapped on something.
   //
   // What happens when the browser then generates a click event?
@@ -78,7 +78,7 @@ ngTouch.directive('ngClick', ['$parse', '$timeout', '$rootElement',
   // So the sequence for a tap is:
   // - global touchstart: Sets an "allowable region" at the point touched.
   // - element's touchstart: Starts a touch
-  // (- touchmove or touchcancel ends the touch, no click follows)
+  // (- touchcancel ends the touch, no click follows)
   // - element's touchend: Determines if the tap is valid (didn't move too far away, didn't hold
   //   too long) and fires the user's tap handler. The touchend also calls preventGhostClick().
   // - preventGhostClick() removes the allowable region the global touchstart created.
@@ -229,10 +229,6 @@ ngTouch.directive('ngClick', ['$parse', '$timeout', '$rootElement',
       touchStartY = e.clientY;
     });
 
-    element.on('touchmove', function(event) {
-      resetState();
-    });
-
     element.on('touchcancel', function(event) {
       resetState();
     });

test/ngTouch/directive/ngClickSpec.js

@@ -125,7 +125,7 @@ describe('ngClick (touch)', function() {
   }));
 
 
-  it('should not click if a touchmove comes before touchend', inject(function($rootScope, $compile, $rootElement) {
+  it('should not prevent click if a touchmove comes before touchend', inject(function($rootScope, $compile, $rootElement) {
     element = $compile('<div ng-click="tapped = true"></div>')($rootScope);
     $rootElement.append(element);
     $rootScope.$digest();
@@ -140,11 +140,11 @@ describe('ngClick (touch)', function() {
     browserTrigger(element, 'touchmove');
     browserTrigger(element, 'touchend',{
       keys: [],
-      x: 400,
-      y: 400
+      x: 15,
+      y: 15
     });
 
-    expect($rootScope.tapped).toBeUndefined();
+    expect($rootScope.tapped).toEqual(true);
   }));
 
   it('should add the CSS class while the element is held down, and then remove it', inject(function($rootScope, $compile, $rootElement) {