Add support dragging to the bottom of a list

core/modules/filters/insertbefore.js

@@ -21,7 +21,7 @@ exports.insertbefore = function(source,operator,options) {
 		results.push(title);
 	});
 	var target = options.widget && options.widget.getVariable(operator.suffix || "currentTiddler");
-	if(target && target !== operator.operand) {
+	if(target !== operator.operand) {
 		// Remove the entry from the list if it is present
 		var pos = results.indexOf(operator.operand);
 		if(pos !== -1) {

core/ui/SideBar/Open.tid

@@ -20,5 +20,11 @@ caption: {{$:/language/SideBar/Open/Caption}}
 </$droppable>
 </div>
 </$list>
-
+<$tiddler tiddler="">
+<$droppable actions=<<drop-actions>>>
+<div class="tc-droppable-placeholder">
+&nbsp;
+</div>
 <$button message="tm-close-all-tiddlers" class="tc-btn-invisible tc-btn-mini"><<lingo Button>></$button>
+</$droppable>
+</$tiddler>