added new clear the buffer function

added new clear the buffer function

jstree/jstree-tests.ts

@@ -75,6 +75,8 @@ a.search('test', false, true);
 //test redraw node
 a.redraw_node($('#node1'), false, false, false);
 
+//test clear buffer
+a.clear_buffer();
 
 //tree with new unique plugin parameters
 var treeWithUnique = $('#treeWithUnique').jstree({

jstree/jstree.d.ts

@@ -1059,6 +1059,13 @@ interface JSTree extends JQuery {
     */
     paste: (obj: any, pos: any) => void;
 
+    /**
+    * clear the buffer of previously copied or cut nodes
+    * @name clear_buffer()
+    * @trigger clear_buffer.jstree
+    */
+    clear_buffer: () => void;
+
     /**
     * put a node in edit mode (input field to rename the node)
     * @name edit(obj [, default_text])
@@ -1223,7 +1230,16 @@ interface JSTree extends JQuery {
     */
     is_undetermined: (obj: any) => boolean;
 
+    /**
+    * called when a node is selected by the user. Used internally.
+    * @private
+    * @name activate_node(obj, e)
+    * @param {mixed} obj the node
+    * @param {Object} e the related event
+    * @trigger activate_node.jstree, changed.jstree
+    */
     activate_node: (obj: any, e: any) => any;
+
     /**
     * check a node (only if tie_selection in checkbox settings is false, otherwise select_node will be called internally)
     * @name check_node(obj)