WICKET-6217 Added test case and improved code
diff --git a/wicket-core/src/main/java/org/apache/wicket/MarkupContainer.java b/wicket-core/src/main/java/org/apache/wicket/MarkupContainer.java
index e99a004..558c13f 100644
--- a/wicket-core/src/main/java/org/apache/wicket/MarkupContainer.java
+++ b/wicket-core/src/main/java/org/apache/wicket/MarkupContainer.java
@@ -2014,7 +2014,8 @@
 	{
 		ChildToDequeueType childType = ChildToDequeueType.fromChild(child);
 		
-		if (childType == ChildToDequeueType.QUEUE_REGION)
+		if (childType == ChildToDequeueType.QUEUE_REGION ||
+			childType == ChildToDequeueType.BORDER)
 		{
 			((IQueueRegion)child).dequeue();			
 		}
@@ -2022,8 +2023,7 @@
 		if (childType == ChildToDequeueType.MARKUP_CONTAINER)
 		{
 			// propagate dequeuing to containers
-			MarkupContainer childContainer = childType == ChildToDequeueType.BORDER ? 
-				((Border)child).getBodyContainer() : (MarkupContainer)child;
+			MarkupContainer childContainer = (MarkupContainer)child;
 			
 			dequeue.pushContainer(childContainer);
 			childContainer.dequeue(dequeue);
diff --git a/wicket-core/src/test/java/org/apache/wicket/queueing/ComponentQueueingTest.java b/wicket-core/src/test/java/org/apache/wicket/queueing/ComponentQueueingTest.java
index 68dd6a0..e889865 100644
--- a/wicket-core/src/test/java/org/apache/wicket/queueing/ComponentQueueingTest.java
+++ b/wicket-core/src/test/java/org/apache/wicket/queueing/ComponentQueueingTest.java
@@ -845,6 +845,30 @@
 		
 		tester.startPage(page);	
 	}
+	@Test
+	public void queueComponentInsideBorderAndEnclosure()
+	{
+		TestPage page = new TestPage();
+		page.setPageMarkup(" <div wicket:id=\"panel\"></div>");
+		
+		TestPanel panel = new TestPanel("panel");
+		panel.setPanelMarkup("<wicket:panel>\n"
+			+ "<div wicket:id=\"border\">\n" +
+			"    <div wicket:enclosure=\"child\">\n" +
+			"      <p wicket:id=\"child\">1</p>\n" +			
+			"    </div>\n" +
+			"  </div>\n" +
+			"</wicket:panel>");
+		
+		TestBorder border = new TestBorder("border");
+		border.setBorderMarkup("<wicket:border><wicket:body/></wicket:border>");
+		
+		panel.add(border);
+		page.add(panel);
+		border.add(new Label("child"));
+				
+		tester.startPage(page);	
+	}
 
 	/**
 	 * https://issues.apache.org/jira/browse/WICKET-6036