Don't automatically focus when attach is called

Only focus when toggling the tree view or revealing
an active file.

This prevents the tree view from stealing focus when it
is attached during deserialization.

src/packages/tree-view/lib/tree-view.coffee

@@ -72,15 +72,12 @@ class TreeView extends ScrollView
     if @hasFocus()
       @detach()
     else
-      if @hasParent()
-        @focus()
-      else
-        @attach()
+      @attach() unless @hasParent()
+      @focus()
 
   attach: ->
     return unless project.getPath()
     rootView.horizontal.prepend(this)
-    @focus()
 
   detach: ->
     @scrollTopAfterAttach = @scrollTop()
@@ -134,6 +131,7 @@ class TreeView extends ScrollView
 
   revealActiveFile: ->
     @attach()
+    @focus()
 
     return unless activeFilePath = rootView.getActiveEditor()?.getPath()