Comments: Remove touchstart event listeners from comment reply/cancel links.

The `touchstart` event on comment reply and cancel links fired before the browser could distinguish a tap from a scroll gesture, causing the reply form to open unexpectedly during scrolling. Since touchscreen users tapping a link already generate a `click` event, the `touchstart` listeners are unnecessary. Prior to ~2015 a `touchstart` event may have been useful to eliminate a 300ms delay for event handlers on tap, but this is long obsolete.

Developed in WordPress#12168.
Follow-up to r42360.

Props edent, szandman, SergeyBiryukov, westonruter, afercia, peterwilsoncc, janpaulkleijn, madhazelnut, joostdevalk, pbearne, eherman24, Znuff.
See #47510, #31590.
Fixes #46713.


git-svn-id: https://develop.svn.wordpress.org/trunk@62511 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/js/_enqueues/lib/comment-reply.js

@@ -93,8 +93,7 @@ window.addComment = ( function( window ) {
 			return;
 		}
 
-		cancelElement.addEventListener( 'touchstart', cancelEvent );
-		cancelElement.addEventListener( 'click',      cancelEvent );
+		cancelElement.addEventListener( 'click', cancelEvent );
 
 		// Submit the comment form when the user types [Ctrl] or [Cmd] + [Enter].
 		var submitFormHandler = function( e ) {
@@ -117,8 +116,7 @@ window.addComment = ( function( window ) {
 		for ( var i = 0, l = links.length; i < l; i++ ) {
 			element = links[i];
 
-			element.addEventListener( 'touchstart', clickEvent );
-			element.addEventListener( 'click',      clickEvent );
+			element.addEventListener( 'click', clickEvent );
 		}
 	}