--- a/openide.text/src/org/openide/text/CloneableEditor.java	Thu Jul 07 12:08:51 2016 +0000
+++ b/openide.text/src/org/openide/text/CloneableEditor.java	Mon Oct 24 18:17:22 2016 -0400
@@ -47,6 +47,8 @@
 import java.awt.Component;
 import java.awt.Dimension;
 import java.awt.Rectangle;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
 import java.io.IOException;
 import java.io.NotSerializableException;
 import java.io.ObjectInput;
@@ -211,7 +213,18 @@
         tmp.putClientProperty("usedByCloneableEditor", true);
 
         this.pane = tmp;
-        
+        this.pane.addKeyListener(new KeyAdapter() {
+          boolean excludeHighlighting = false;
+          @Override
+          public void keyPressed(KeyEvent e) {
+            if (e.getKeyCode() == KeyEvent.VK_SHIFT) {
+              excludeHighlighting = !excludeHighlighting;
+              pane.putClientProperty("HighlightsLayerExcludes", excludeHighlighting
+                  ? "^org\\.netbeans\\.modules\\.editor\\.lib2\\.highlighting\\..*$" : null);
+            }
+          }
+        });
+
         synchronized (getInitializerLock()) {
             this.componentCreated = true;
             initializer = new CloneableEditorInitializer(this, support, pane);