Allow markup in Grid DND feedback widget

Drag and drop feedback widget shows the markup as plain text during drag
operation.
Do not escape item text in DND feedback widget if markup is enabled on
Grid.

Bug 579671: [Markup] Drag decoration issue on controls with markups
https://bugs.eclipse.org/bugs/show_bug.cgi?id=579671

Change-Id: I3b7708d9e39140a3e31a19ee414aa64d20b3d57c

bundles/org.eclipse.rap.rwt/js/rwt/remote/DNDSupport.js

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2015 Innoopract Informationssysteme GmbH and others.
+ * Copyright (c) 2009, 2022 Innoopract Informationssysteme GmbH and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -448,7 +448,10 @@ rwt.remote.DNDSupport.prototype = {
       widget.setBackgroundColor( backgroundColor );
       widget.setTextColor( textColor );
       var text = item.getText( config.treeColumn );
-      widget.setCellContent( 1, rwt.util.Encoding.escapeText( text, false ) );
+      if( !config.markupEnabled ) {
+        text = rwt.util.Encoding.escapeText( text, false );
+      }
+      widget.setCellContent( 1, text );
       widget.setFont( config.font );
     }
   },