Tighten up search for parent pane

The introduction of the .flexbox-redraw-hack required the query to be
loosened, but I went too far. We don't want to return a pane for mini
editors that happen to be nested on another view that's inside a pane.

src/editor-view.coffee

@@ -1073,7 +1073,7 @@ class EditorView extends View
   #
   # Returns a {Pane}.
   getPane: ->
-    @parents('.pane').view()
+    @parent('.item-views').parents('.pane').view()
 
   remove: (selector, keepData) ->
     return super if keepData or @removed