### Eclipse Workspace Patch 1.0
#P org.eclipse.swt
Index: Eclipse SWT/gtk/org/eclipse/swt/widgets/Combo.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Combo.java,v
retrieving revision 1.212
diff -u -r1.212 Combo.java
--- Eclipse SWT/gtk/org/eclipse/swt/widgets/Combo.java	23 Dec 2010 19:18:09 -0000	1.212
+++ Eclipse SWT/gtk/org/eclipse/swt/widgets/Combo.java	10 Feb 2011 18:26:31 -0000
@@ -10,6 +10,8 @@
  *******************************************************************************/
 package org.eclipse.swt.widgets;
 
+import java.util.HashSet;
+import java.util.Set;
 
 import org.eclipse.swt.*;
 import org.eclipse.swt.internal.*;
@@ -571,35 +573,28 @@
 }
 
 int /*long*/ findPopupHandle (int /*long*/ oldList) {
+	// We get two lists of top-level window handles, one before creation of the combo box
+	// and one after. The first window handle that is present in the second list but not in
+	// the first one is assumed to be the handle of the popup window of the combo box.
 	int /*long*/ hdl = 0;
-	int /*long*/ currentList = OS.gtk_window_list_toplevels();
-	int /*long*/ oldFromList = oldList;
-	int /*long*/ newFromList = currentList;
-	boolean isFound;
-	while (newFromList != 0) {
-		int /*long*/ newToplevel = OS.g_list_data(newFromList);
-		isFound = false;
-		oldFromList = oldList;
-		while (oldFromList != 0) {
-			int /*long*/ oldToplevel = OS.g_list_data(oldFromList);
-			if (newToplevel == oldToplevel) {
-				isFound = true;
-				break;
-			}
-			oldFromList = OS.g_list_next(oldFromList);
-		}
-		if (!isFound) {
-			hdl = newToplevel;
+	Set oldHandles = new HashSet(400);
+	for (int item = oldList; item != 0; item = OS.g_list_next(item)) {
+		oldHandles.add(new Integer(OS.g_list_data(item)));
+	}
+
+	int /*long*/ newList = OS.gtk_window_list_toplevels();
+	for (int item = newList; item != 0; item = OS.g_list_next(item)) {
+		int handle = OS.g_list_data(item);
+		if (!oldHandles.contains(new Integer(handle))) {
+			hdl = handle;
 			break;
 		}
-		newFromList = OS.g_list_next(newFromList);
 	}
 	OS.g_list_free(oldList);
-	OS.g_list_free(currentList);
+	OS.g_list_free(newList);
 	return hdl;
 }
 
-
 void findButtonHandle() {
 	/*
 	* Feature in GTK.  There is no API to query the button