Remove 'project_hidden' state

Compute it using project/context state

Notable change:
todo.hidden? now also returns true if the todo is completed

test/controllers/contexts_controller_test.rb

@@ -13,7 +13,17 @@ class ContextsControllerTest < ActionController::TestCase
     get :show, { :id => "1" }
     assert_equal 'TRACKS::Context: agenda', assigns['page_title']
   end
-  
+
+  def test_shows_todos_when_hidden
+    c = contexts(:agenda)
+    todos = c.todos.active
+    assert_equal 6, todos.size
+    c.hide!
+    login_as :admin_user
+    get :show, { :id => '1'}
+    assert_equal 6, assigns['not_done_todos'].size
+  end
+
   def test_show_renders_show_template
     login_as :admin_user
     get :show, { :id => "1" }

test/controllers/projects_controller_test.rb

@@ -52,13 +52,13 @@ class ProjectsControllerTest < ActionController::TestCase
     assert_ajax_create_increments_count 'My New Project'
   end
 
-  def test_todo_state_is_project_hidden_after_hiding_project
+  def test_todo_is_hidden_after_hiding_project
     p = projects(:timemachine)
     todos = p.todos.active
     login_as(:admin_user)
     xhr :post, :update, :id => 1, "project"=>{"name"=>p.name, "description"=>p.description, "state"=>"hidden"}
     todos.each do |t|
-      assert_equal :project_hidden, t.reload().aasm.current_state
+      assert t.reload().hidden?
     end
     assert p.reload().hidden?
   end

test/controllers/todos_controller_test.rb

@@ -381,7 +381,7 @@ class TodosControllerTest < ActionController::TestCase
     assert p.reload().hidden?
     todo = p.todos.first
 
-    assert todo.project_hidden?, "todo should be project_hidden"
+    assert todo.hidden?, 'todo should be hidden'
 
     # clear project from todo: the todo should be unhidden
     xhr :post, :update, :id => todo.id, :_source_view => 'todo', "project_name"=>"", "todo"=>{}