Change to use jQuery's function for checking if a single element is visible.

To achieve the same comprehensive check of visibility as the original
$el.is(":visible") code, we use jQuery's function for checking if a
single element is visible.  Which is a different method to
$el.is(":visible") which looks for $el in the array of elements that
match :visible from the entire DOM

Author: markdon

src/view.coffee

@@ -44,7 +44,7 @@ class View
   #
   # @return [Boolean]
   visible: ->
-    @$el[0].style.display == "block"
+    $.expr.filters.visible(@$el[0])
 
   highlighted: ->
     @$el.find(".cur").length > 0