Fixed dropping Link effect

Author: joaompneves

CefSharp.Example/Resources/DragDropCursorsTest.html

@@ -27,13 +27,18 @@
         }
 
         function drag(ev) {
-            ev.dataTransfer.setData("text", ev.target.id);
+            ev.dataTransfer.effectAllowed = "all";
+            ev.dataTransfer.setData("text/plain", ev.target.id);
         }
 
         function drop(ev) {
             ev.preventDefault();
-            var data = ev.dataTransfer.getData("text");
-            ev.target.appendChild(document.getElementById(data));
+            var data = ev.dataTransfer.getData("text/plain");
+            var element = document.getElementById(data);
+            if (element) {
+                ev.target.appendChild(element);
+            }
+            alert(ev.dataTransfer.dropEffect + " | " + data);
         }
     </script>
 </head>

CefSharp.Wpf/Internals/DragOperationMaskExtensions.cs

@@ -50,7 +50,8 @@ public static DragDropEffects GetDragEffects(this DragOperationsMask mask)
         {
             if ((mask & DragOperationsMask.Every) == DragOperationsMask.Every)
             {
-                return DragDropEffects.All;
+                // return all effects (!= DragDropEffects.All, which doesn't include Link)
+                return DragDropEffects.Scroll | DragDropEffects.Copy | DragDropEffects.Move | DragDropEffects.Link;
             }
             if ((mask & DragOperationsMask.Copy) == DragOperationsMask.Copy)
             {