Inconsistent behavior in the views file

Please look at the following code snippet in a views partial labeled _js_head.html.erb in my project:

<% content_for :head do %>
    <%= stylesheet_link_tag '/javascripts/jsTree/source/tree_component.css' %>
    <%= javascript_include_tag 'jsTree/source/_lib.js' %>
    <%= javascript_include_tag 'jsTree/source/tree_component.js' %>

    <%= javascript_include_tag 'jquery.alerts/jquery.alerts.js' %>
    <%= stylesheet_link_tag '/javascripts/jquery.alerts/jquery.alerts.css' %>
    <%= stylesheet_link_tag '/javascripts/jquery.alerts/jquery.alerts.spree.css' %>

  <%= javascript_tag "var AUTH_TOKEN = #{form_authenticity_token.inspect};" if protect_against_forgery? %>
  <%= javascript_tag "var practice_id = #{current_practice.id}" %>
  <%= javascript_include_tag 'folders_tree.js' %>
<% end %>

Rubymine has trouble resolving a javascript_include_tag file that has the file name extension ".js" attached to it.  If you omit the extension, it has no problems, and F4 will load the referenced file.  The stylesheet_link_tag does not have this problem.

Bharat