Ticket #6919: dragdrop.js.diff.1

Index: dragdrop.js
===================================================================
--- dragdrop.js (revision 5831)
+++ dragdrop.js (working copy)
@@ -172,6 +172,9 @@
     this._lastPointer = pointer;
     
     this.activeDraggable.updateDrag(event, pointer);
+    Event.shiftPressed=event.shiftKey;
+    Event.altPressed  =event.altKey;
+    Event.ctrlPressed =event.ctrlKey;
   },
   
   endDrag: function(event) {
@@ -719,9 +722,19 @@
 
   onHover: function(element, dropon, overlap) {
     if(Element.isParent(dropon, element)) return;
-
-    if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
-      return;
+    if(Sortable.options(dropon).tree && Event.ctrlPressed && overlap > .05 && overlap < .8) {
+      var oldParentNode = element.parentNode;
+      var droponOptions = Sortable.options(dropon);
+      var children = Sortable.findElements(dropon, {tag: droponOptions.treeTag, only: droponOptions.only});
+      if(dropon.tagName.toUpperCase() == Sortable.options(dropon).tag.toUpperCase() && children.length==1){
+        children[0].insertBefore(element, null);
+        Sortable.options(oldParentNode).onChange(element);
+       droponOptions.onChange(element);
+      }
+    } else if(overlap > .33 && overlap < .66) {
+        return;
+    } else if(Event.shiftPressed && element.parentNode != dropon.parentNode) {
+       return;
     } else if(overlap>0.5) {
       Sortable.mark(dropon, 'before');
       if(dropon.previousSibling != element) {
@@ -749,14 +762,13 @@
   onEmptyHover: function(element, dropon, overlap) {
     var oldParentNode = element.parentNode;
     var droponOptions = Sortable.options(dropon);
-        
     if(!Element.isParent(dropon, element)) {
       var index;
-      
+            
       var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
       var child = null;
             
-      if(children) {
+      if(children.length) {
         var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
         
         for (index = 0; index < children.length; index += 1) {
@@ -771,7 +783,7 @@
           }
         }
       }
-      
+
       dropon.insertBefore(element, child);
       
       Sortable.options(oldParentNode).onChange(element);