After deleting, the next message is selected.

mailnews/base/resources/content/commandglue.js

@@ -414,12 +414,66 @@ function FolderTest5000()
 	dump("Time to load is " +  timeToLoad + " seconds\n");
 }
 
-function SelectNextMessage(messages)
+function GetNextMessageAfterDelete(messages)
 {
 	var count = messages.length;
 
-	
-	var nextMessage = GetNextMessage(messages[0], GoMessage, false)
+	var curMessage = messages[0];
+	var nextMessage = null;
+	//search forward
+	while(curMessage)
+	{
+		nextMessage = GetNextMessage(curMessage, GoMessage, false);
+		if(nextMessage)
+		{
+			if(!MessageInSelection(nextMessage, messages))
+			{
+				break;
+			}
+		}
+		curMessage = nextMessage;
+	}
+	//if no nextmessage then search backwards
+	if(!nextMessage)
+	{
+
+		var curMessage = messages[0];
+		var nextMessage = null;
+		//search forward
+		while(curMessage)
+		{
+			nextMessage = GetPreviousMessage(curMessage, GoMessage, false);
+			if(nextMessage)
+			{
+				if(!MessageInSelection(nextMessage, messages))
+				{
+					break;
+				}
+			}
+			curMessage = nextMessage;
+		}
+
+
+
+	}
+	return nextMessage;
+}
+
+function MessageInSelection(message, messages)
+{
+	var count = messages.length;
+
+	for(var i = 0; i < count; i++)
+	{
+		if(message == messages[i])
+			return true;
+
+	}
+	return false;
+}
+
+function SelectNextMessage(nextMessage)
+{
 	var tree = GetThreadTree();
 	ChangeSelection(tree, nextMessage);
 

mailnews/base/resources/content/msgViewNavigation.js

@@ -52,11 +52,7 @@ function GoNextMessage(nextFunction, startFromBeginning)
 	if ( selArray && (selArray.length == 1) )
 	{
 		var nextMessage = GetNextMessage(selArray[0], nextFunction, startFromBeginning);
-		if(nextMessage)
-		{
-			tree.clearItemSelection();
-			tree.selectItem(nextMessage);
-		}
+		ChangeSelection(tree, nextMessage);
 	}
 }
 
@@ -111,11 +107,7 @@ function GoPreviousMessage(previousFunction, startFromEnd)
 	if ( selArray && (selArray.length == 1) )
 	{
 		var previousMessage = GetPreviousMessage(selArray[0], previousFunction, startFromEnd);
-		if(previousMessage)
-		{
-			tree.clearItemSelection();
-			tree.selectItem(previousMessage);
-		}
+		ChangeSelection(tree, previousMessage);
 	}
 }
 
@@ -154,3 +146,11 @@ function GetPreviousMessage(currentMessage, previousFunction, startFromEnd)
 	return previousMessage;
 }
 
+function ChangeSelection(tree, newMessage)
+{
+	if(newMessage)
+	{
+		tree.clearItemSelection();
+		tree.selectItem(newMessage);
+	}
+}

mailnews/base/resources/content/widgetglue.js

@@ -82,8 +82,10 @@ function MsgDeleteMessage(fromToolbar)
 	dump("tree is valid\n");
 	//get the selected elements
 	var messageList = tree.selectedItems;
+	var nextMessage = GetNextMessageAfterDelete(messageList);
 	//get the current folder
 	messenger.DeleteMessages(tree, srcFolder, messageList);
+	SelectNextMessage(nextMessage);
   }
 }