MDL-43334 backup: Fix cancel JS

The cancel button is a form element within a div that has the confirmcancel class. When we
accept a cancel modal, we should attempt to click the most specific form element of the
div, not the entire div.

backup/util/ui/yui/build/moodle-backup-confirmcancel/moodle-backup-confirmcancel-debug.js

@@ -68,8 +68,17 @@ M.core_backup.confirmcancel = {
             // Detach the listeners for the confirm box so they don't fire again.
             new Y.EventHandle(M.core_backup.confirmcancel.listeners).detach();
 
+            // The currentTarget is a div surrounding the form elements. Simulating a click on the div is
+            // not going to submit a form so we need to find the form element to click.
+            var element = e.currentTarget.one('input, select, button');
+
             // Simulate the original cancel button click.
-            e.currentTarget.simulate('click');
+            if (element) {
+                element.simulate('click');
+            } else {
+                // Backwards compatibility only.
+                e.currentTarget.simulate('click');
+            }
         }, this);
 
 

backup/util/ui/yui/build/moodle-backup-confirmcancel/moodle-backup-confirmcancel.js

@@ -68,8 +68,17 @@ M.core_backup.confirmcancel = {
             // Detach the listeners for the confirm box so they don't fire again.
             new Y.EventHandle(M.core_backup.confirmcancel.listeners).detach();
 
+            // The currentTarget is a div surrounding the form elements. Simulating a click on the div is
+            // not going to submit a form so we need to find the form element to click.
+            var element = e.currentTarget.one('input, select, button');
+
             // Simulate the original cancel button click.
-            e.currentTarget.simulate('click');
+            if (element) {
+                element.simulate('click');
+            } else {
+                // Backwards compatibility only.
+                e.currentTarget.simulate('click');
+            }
         }, this);
 
 

backup/util/ui/yui/src/confirmcancel/js/confirmcancel.js

@@ -66,8 +66,17 @@ M.core_backup.confirmcancel = {
             // Detach the listeners for the confirm box so they don't fire again.
             new Y.EventHandle(M.core_backup.confirmcancel.listeners).detach();
 
+            // The currentTarget is a div surrounding the form elements. Simulating a click on the div is
+            // not going to submit a form so we need to find the form element to click.
+            var element = e.currentTarget.one('input, select, button');
+
             // Simulate the original cancel button click.
-            e.currentTarget.simulate('click');
+            if (element) {
+                element.simulate('click');
+            } else {
+                // Backwards compatibility only.
+                e.currentTarget.simulate('click');
+            }
         }, this);