Only take the focus if the "auto popup" property is switched on. Patch provided by Vieri on July 26.

src/net/java/sip/communicator/impl/gui/main/chat/ChatWindow.java

@@ -1141,14 +1141,27 @@ public void fileDropped(File file, Point point)
      */
     public void openChat(ChatPanel chatPanel, boolean setSelected)
     {
+        boolean isWindowVisible = isVisible();
+
         if(getExtendedState() != JFrame.ICONIFIED)
         {
             if(ConfigurationManager.isAutoPopupNewMessage() || setSelected)
+            {
+                if (!isVisible())
+                    setVisible(true);
+
                 toFront();
+            }
+            else
+            {
+                setFocusableWindowState(false);
+                setVisible(true);
+                setFocusableWindowState(true);
+            }
         }
         else
         {
-            if(setSelected)
+            if (setSelected)
             {
                 setExtendedState(JFrame.NORMAL);
                 toFront();
@@ -1160,7 +1173,7 @@ public void openChat(ChatPanel chatPanel, boolean setSelected)
                 setTitle("*" + chatWindowTitle);
         }
 
-        if(setSelected)
+        if (setSelected || !isWindowVisible)
         {
             setCurrentChat(chatPanel);
         }

src/net/java/sip/communicator/impl/gui/main/chat/ChatWindowManager.java

@@ -79,15 +79,7 @@ public void run()
             if(!chatPanel.isShown())
                 chatContainer.addChat(chatPanel);
 
-            if(chatContainer.getFrame().isVisible())
-            {
-                chatContainer.openChat(chatPanel, setSelected);
-            }
-            else
-            {
-                chatContainer.getFrame().setVisible(true);
-                chatContainer.setCurrentChat(chatPanel);
-            }
+            chatContainer.openChat(chatPanel, setSelected);
         }
     }