Fix drag after adding a question

www/form/inner.js

@@ -2283,7 +2283,7 @@ define([
                 filter: "input, button, .CodeMirror, .cp-form-type-sort",
                 preventOnFilter: false,
                 draggable: ".cp-form-block",
-                forceFallback: true,
+                //forceFallback: true,
                 fallbackTolerance: 5,
                 onStart: function () {
                     $container.find('.cp-form-creator-add-inline').remove();
@@ -2334,17 +2334,17 @@ define([
         $toolbarContainer.after(helpMenu.menu);
 
         var offlineEl = h('div.alert.alert-danger.cp-burn-after-reading', Messages.disconnected);
-        var oldFilter;
         framework.onEditableChange(function (editable) {
             if (editable) {
-                if (APP.mainSortable) { APP.mainSortable.options.filter = oldFilter; }
+                if (APP.mainSortable) {
+                    APP.mainSortable.options.disabled = false;
+                }
                 if (!APP.isEditor) { $(offlineEl).remove(); }
                 $body.removeClass('cp-form-readonly');
                 $('.cp-form-creator-settings').find('input, button').removeAttr('disabled');
             } else {
                 if (APP.mainSortable) {
-                    oldFilter = APP.mainSortable.options.filter;
-                    APP.mainSortable.options.filter = function () { return true; };
+                    APP.mainSortable.options.disabled = true;
                 }
                 if (!APP.isEditor) { $('.cp-help-container').before(offlineEl); }
                 $body.addClass('cp-form-readonly');