fix missing rtl stylesheets

app/controllers/stylesheets_controller.rb

@@ -5,7 +5,7 @@ class StylesheetsController < ApplicationController
 
     no_cookies
 
-    target,digest = params[:name].split("_")
+    target,digest = params[:name].split(/_([a-f0-9]{40})/)
 
     cache_time = request.env["HTTP_IF_MODIFIED_SINCE"]
     cache_time = Time.rfc2822(cache_time) rescue nil if cache_time

lib/sass/discourse_stylesheets.rb

@@ -15,6 +15,7 @@ class DiscourseStylesheets
   end
 
   def self.stylesheet_link_tag(target = :desktop)
+
     tag = cache[target]
 
     return tag.dup.html_safe if tag

spec/controllers/stylesheets_controller_spec.rb

@@ -3,21 +3,36 @@ require 'spec_helper'
 describe StylesheetsController do
 
   it 'can survive cache miss' do
-    DiscourseStylesheets.cache.clear
-    DiscourseStylesheets.stylesheet_link_tag('desktop_rtl')
 
     StylesheetCache.destroy_all
+    builder = DiscourseStylesheets.new('desktop_rtl')
+    builder.compile
+
+    digest = StylesheetCache.first.digest
+    StylesheetCache.destroy_all
 
     # digestless
     get :show, name: 'desktop_rtl'
     expect(response).to be_success
 
+    StylesheetCache.destroy_all
+
+    get :show, name: "desktop_rtl_#{digest}"
+    expect(response).to be_success
+
+    cached = StylesheetCache.first
+    expect(cached.target).to eq 'desktop_rtl'
+    expect(cached.digest).to eq digest
+
     # tmp folder destruction and cached
     `rm #{DiscourseStylesheets.cache_fullpath}/*`
 
     get :show, name: 'desktop_rtl'
     expect(response).to be_success
 
+    get :show, name: "desktop_rtl_#{digest}"
+    expect(response).to be_success
+
     # there is an edge case which is ... disk and db cache is nuked, very unlikely to happen
 
   end