Update path text when active item title changes

Closes #573

src/packages/status-bar/lib/status-bar-view.coffee

@@ -27,6 +27,8 @@ class StatusBarView extends View
     @subscribe @pane, 'pane:active-item-changed', =>
       @subscribeToBuffer()
       @updatePathText()
+    @subscribe @pane, 'pane:active-item-title-changed', =>
+      @updatePathText()
 
     @subscribe @pane, 'cursor:moved', => @updateCursorPositionText()
     @subscribe @grammarName, 'click', => @pane.activeView.trigger 'grammar-selector:show'

src/packages/status-bar/spec/status-bar-spec.coffee

@@ -233,3 +233,14 @@ describe "StatusBar", ->
       view = $$ -> @div id: 'view', tabindex: -1, 'View'
       editor.getPane().showItem(view)
       expect(statusBar.currentPath).toBeHidden()
+
+  describe "when the active item's title changes", ->
+    it "updates the path view with the new title", ->
+      rootView.attachToDom()
+      view = $$ -> @div id: 'view', tabindex: -1, 'View'
+      view.getTitle = => 'View Title'
+      editor.getPane().showItem(view)
+      expect(statusBar.currentPath.text()).toBe 'View Title'
+      view.getTitle = => 'New Title'
+      view.trigger 'title-changed'
+      expect(statusBar.currentPath.text()).toBe 'New Title'