FIX: correctly invalidate theme css cache on scheme change

lib/stylesheet/manager.rb

@@ -251,7 +251,7 @@ class Stylesheet::Manager
       raise "attempting to look up theme digest for invalid field"
     end
 
-    Digest::SHA1.hexdigest scss.to_s
+    Digest::SHA1.hexdigest(scss.to_s + color_scheme_digest.to_s)
   end
 
   def color_scheme_digest

spec/controllers/admin/themes_controller_spec.rb

@@ -28,7 +28,6 @@ describe Admin::ThemesController do
         expect(upload.id).not_to be_nil
         expect(JSON.parse(response.body)["upload_id"]).to eq(upload.id)
       end
-
     end
 
     context '.import' do

spec/models/color_scheme_spec.rb

@@ -8,6 +8,21 @@ describe ColorScheme do
     {name: '$secondary_background_color', hex: '888888'}
   ]}
 
+  it "correctly invalidates theme css when changed" do
+    scheme = ColorScheme.create_from_base(name: 'Bob')
+    theme = Theme.new(name: 'Amazing Theme', color_scheme_id: scheme.id, user_id: -1)
+    theme.set_field(name: :scss, target: :desktop, value: '.bob {color: $primary;}')
+    theme.save!
+
+    href = Stylesheet::Manager.stylesheet_href(:desktop_theme, theme.key)
+
+    ColorSchemeRevisor.revise(scheme, colors: [{ name: 'primary', hex: 'bbb' }])
+
+    href2 = Stylesheet::Manager.stylesheet_href(:desktop_theme, theme.key)
+
+    expect(href).not_to eq(href2)
+  end
+
   describe "new" do
     it "can take colors" do
       c = ColorScheme.new(valid_params)
@@ -27,7 +42,7 @@ describe ColorScheme do
                     Fabricate(:color_scheme_color, name: 'third_one', hex: base_colors[:third_one])]) }
 
     before do
-      described_class.stubs(:base).returns(base)
+       ColorScheme.stubs(:base).returns(base)
     end
 
     it "creates a new color scheme" do