Whoops! We can't revert an autogen course from disk. My bad.

TODO: is there a cheaper way to fix up the autogen courses?

stepmania/src/SongManager.cpp

@@ -799,7 +799,6 @@ void SongManager::InitAutogenCourses()
 	}
 }
 
-
 void SongManager::FreeCourses()
 {
 	for( unsigned i=0; i<m_pCourses.size(); i++ )
@@ -814,6 +813,26 @@ void SongManager::FreeCourses()
 	m_mapCourseGroupToInfo.clear();
 }
 
+void SongManager::DeleteAutogenCourses()
+{
+	vector<Course*> vNewCourses;
+	for( vector<Course*>::iterator it = m_pCourses.begin(); it != m_pCourses.end(); ++it )
+	{
+		if( (*it)->m_bIsAutogen )
+		{
+			delete *it;
+		}
+		else
+		{
+			vNewCourses.push_back( *it );
+		}
+	}
+	m_pCourses.swap( vNewCourses );
+	UpdatePopular();
+	UpdateShuffled();
+	RefreshCourseGroupInfo();
+}
+
 void SongManager::AddCourse( Course *pCourse )
 {
 	m_pCourses.push_back( pCourse );
@@ -861,15 +880,21 @@ void SongManager::Cleanup()
 
 /* Flush all Song*, Steps* and Course* caches.  This is when a Song or its Steps
  * are removed or changed.  This doesn't touch GAMESTATE and StageStats
- * pointers.  Currently, the only time Steps are altered independantly of the
+ * pointers.  Currently, the only time Steps are altered independently of the
  * Courses and Songs is in Edit Mode, which updates the other pointers it needs. */
 void SongManager::Invalidate( const Song *pStaleSong )
 {
+	// TODO: This is unnecessarily expensive.
+	// Can we regenerate only the autogen courses that are affected?
+	DeleteAutogenCourses();
+
 	FOREACH( Course*, this->m_pCourses, pCourse )
 	{
 		(*pCourse)->Invalidate( pStaleSong );
 	}
 
+	InitAutogenCourses();
+
 	UpdatePopular();
 	UpdateShuffled();
 	RefreshCourseGroupInfo();

stepmania/src/SongManager.h

@@ -49,6 +49,7 @@ public:
 	void FreeCourses();
 	void AddCourse( Course *pCourse );	// transfers ownership of pCourse
 	void DeleteCourse( Course *pCourse );	// transfers ownership of pCourse
+	void DeleteAutogenCourses();		// deletes every autogen course
 	void InvalidateCachedTrails();
 
 	void InitAll( LoadingWindow *ld );	// songs, courses, groups - everything.