Bug 517481 - MemoryRetrievalProxy listener isn't added when opening
MemoryView with no active debug session

Change-Id: Ia272e26409d63d19422a7a0f012d48aeb3d6ca71

org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/views/memory/MemoryBlocksTreeViewPane.java

diff --git a/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/views/memory/MemoryBlocksTreeViewPane.java b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/views/memory/MemoryBlocksTreeViewPane.java
index 2e41795..e448c0d 100644
--- a/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/views/memory/MemoryBlocksTreeViewPane.java
+++ b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/views/memory/MemoryBlocksTreeViewPane.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2004, 2010 IBM Corporation and others.
+ * Copyright (c) 2004, 2017 IBM Corporation 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
@@ -257,9 +257,7 @@
 				{
 					IAdaptable context = (IAdaptable)obj;
 					IMemoryBlockRetrieval retrieval = MemoryViewUtil.getMemoryBlockRetrieval(context);
-					if (retrieval != null && retrieval != fRetrieval &&
-						fTreeViewer != null && fTreeViewer.getContentProvider() != null)
-					{
+					if (retrieval != null && fTreeViewer != null && (retrieval != fRetrieval || retrieval != fTreeViewer.getInput()) && fTreeViewer.getContentProvider() != null) {
 						// set new setting
 						fRetrieval = retrieval;
 						fTreeViewer.setInput(fRetrieval);