mujma: Added deleting thumbnails after moving a photo.

(merged from branches/gsoc)


git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/trunk@41924 467b73ca-7a2a-4603-9d3b-597d59a354a9

code/AssetAdmin.php

@@ -319,6 +319,9 @@ HTML;
 				$files = DataObject::get("File", "`File`.ID IN ($fileList)");
 				if($files) {
 					foreach($files as $file) {
+						if($file instanceof Image) {
+                            $file->deleteFormattedImages();
+                        }
 						$file->ParentID = $destFolderID;
 						$file->write();
 						$numFiles++;