MDL-45338 editor_atto: Correct gesturemoveend listening

Delegate gesturemoveend rather than listen to ensure adequate event filters
and that we apply to only the correct editor.

lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor-debug.js

@@ -985,7 +985,7 @@ EditorSelection.prototype = {
 
         // To capture both mouseup and touchend events, we need to track the gesturemoveend event in standAlone mode. Without
         // standAlone, it will only fire if we listened to a gesturemovestart too.
-        Y.one(Y.config.doc.body).on('gesturemoveend', this._hasSelectionChanged, {
+        Y.delegate('gesturemoveend', this._hasSelectionChanged, document.body, '#' + this.editor.get('id'), {
                 standAlone: true
             }, this);
 

lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor.js

@@ -980,7 +980,7 @@ EditorSelection.prototype = {
 
         // To capture both mouseup and touchend events, we need to track the gesturemoveend event in standAlone mode. Without
         // standAlone, it will only fire if we listened to a gesturemovestart too.
-        Y.one(Y.config.doc.body).on('gesturemoveend', this._hasSelectionChanged, {
+        Y.delegate('gesturemoveend', this._hasSelectionChanged, document.body, '#' + this.editor.get('id'), {
                 standAlone: true
             }, this);
 

lib/editor/atto/yui/src/editor/js/selection.js

@@ -94,7 +94,7 @@ EditorSelection.prototype = {
 
         // To capture both mouseup and touchend events, we need to track the gesturemoveend event in standAlone mode. Without
         // standAlone, it will only fire if we listened to a gesturemovestart too.
-        Y.one(Y.config.doc.body).on('gesturemoveend', this._hasSelectionChanged, {
+        Y.delegate('gesturemoveend', this._hasSelectionChanged, document.body, '#' + this.editor.get('id'), {
                 standAlone: true
             }, this);