Media: Fix image cropping on touch screen devices.

* In initCrop, handle touch events in addition to mouse events.
* In imageSelect jQuery plugin, accept event.which of 0 as provided by touch events.

Props yahil, alexgso, joemcgill.
Fixes #41242.


git-svn-id: https://develop.svn.wordpress.org/trunk@42818 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/image-edit.js

@@ -653,7 +653,7 @@
 				 *
 				 * @returns {void}
 				 */
-				parent.children().mousedown(function(e){
+				parent.children().on( 'mousedown, touchstart', function(e){
 					var ratio = false, sel, defRatio;
 
 					if ( e.shiftKey ) {

src/wp-includes/js/imgareaselect/jquery.imgareaselect.js

@@ -748,7 +748,7 @@ $.imgAreaSelect = function (img, options) {
      */
     function imgMouseDown(event) {
         /* Ignore the event if animation is in progress */
-        if (event.which != 1 || $outer.is(':animated')) return false;
+        if (event.which > 1 || $outer.is(':animated')) return false;
 
         adjust();
         startX = x1 = evX(event);