Compute the number of unread messages in reducer

app/lib/redux/reducers/toolarea.js

@@ -1,7 +1,8 @@
 const initialState =
 {
 	toolAreaOpen   : false,
-	currentToolTab : 'chat' // chat, settings, users
+	currentToolTab : 'chat', // chat, settings, users
+	unread         : 0
 };
 
 const toolarea = (state = initialState, action) =>
@@ -11,15 +12,27 @@ const toolarea = (state = initialState, action) =>
 		case 'TOGGLE_TOOL_AREA':
 		{
 			const toolAreaOpen = !state.toolAreaOpen;
+			const unread = toolAreaOpen && state.currentToolTab === 'chat' ? 0 : state.unread;
 
-			return { ...state, toolAreaOpen };
+			return { ...state, toolAreaOpen, unread };
 		}
 
 		case 'SET_TOOL_TAB':
 		{
 			const { toolTab } = action.payload;
+			const unread = toolTab === 'chat' ? 0 : state.unread;
 
-			return { ...state, currentToolTab: toolTab };
+			return { ...state, currentToolTab: toolTab, unread };
+		}
+
+		case 'ADD_NEW_RESPONSE_MESSAGE':
+		{
+			if (state.toolAreaOpen && state.currentToolTab === 'chat') 
+			{
+				return state;
+			}
+
+			return { ...state, unread: state.unread + 1 };
 		}
 
 		default: