140272 - Editing OS.java really slow
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/TreeItem.java b/bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/TreeItem.java
index 79a2972..47ef49b 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/TreeItem.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/TreeItem.java
@@ -1022,6 +1022,7 @@
  */
 public void setExpanded (boolean expanded) {
 	checkWidget ();
+	if (expanded == getExpanded ()) return;
 	parent.ignoreExpand = true;
 	if (expanded) {
 		OS.OpenDataBrowserContainer (parent.handle, id);