SetSavedToDisk in Save(), not in SM_SaveSuccessful. When we save the

whole file, all steps are saved to disk; we were only marking the
active steps.  This sequence would cause steps to be wrongly deleted:
 1: create easy and medium steps for one steps type; save
 2: on another steps type, edit easy steps which were autogenned from the above
        change the steps
 3: f6 to change to medium steps steps which were autogenned from the above
 4: menu -> save
        This will save all data, but only medium will be marked saved to disk.
 5: f5 to change back to easy steps
 6: menu -> exit
        This will delete the easy steps, because they were not marked saved to disk.

stepmania/src/NotesWriterSM.cpp

@@ -195,7 +195,7 @@ static RString GetSMNotesTag( const Song &song, const Steps &in, bool bSavingCac
 	return JoinLineList( lines );
 }
 
-bool NotesWriterSM::Write( RString sPath, const Song &out, bool bSavingCache )
+bool NotesWriterSM::Write( RString sPath, const Song &out, const vector<Steps*>& vpStepsToSave, bool bSavingCache )
 {
 	/* Flush dir cache when writing steps, so the old size isn't cached. */
 	FILEMAN->FlushDirCache( Dirname(sPath) );
@@ -229,19 +229,11 @@ bool NotesWriterSM::Write( RString sPath, const Song &out, bool bSavingCache )
 	}
 
 	//
-	// Save all Steps for this file
+	// Save specified Steps to this file
 	//
-	const vector<Steps*>& vpSteps = out.GetAllSteps();
-	FOREACH_CONST( Steps*, vpSteps, s ) 
+	FOREACH_CONST( Steps*, vpStepsToSave, s ) 
 	{
 		const Steps* pSteps = *s;
-		if( pSteps->IsAutogen() )
-			continue; /* don't write autogen notes */
-
-		/* Only save steps that weren't loaded from a profile. */
-		if( pSteps->WasLoadedFromProfile() )
-			continue;
-
 		RString sTag = GetSMNotesTag( out, *pSteps, bSavingCache );
 		f.PutLine( sTag );
 	}

stepmania/src/NotesWriterSM.h

@@ -7,7 +7,7 @@ class Song;
 class Steps;
 namespace NotesWriterSM
 {
-	bool Write( RString sPath, const Song &out, bool bSavingCache );
+	bool Write( RString sPath, const Song &out, const vector<Steps*>& vpStepsToSave, bool bSavingCache );
 	void GetEditFileContents( const Song *pSong, const Steps *pSteps, RString &sOut );
 	RString GetEditFileName( const Song *pSong, const Steps *pSteps );
 	bool WriteEditFileToMachine( const Song *pSong, Steps *pSteps, RString &sErrorOut );

stepmania/src/ScreenEdit.cpp

@@ -2551,7 +2551,6 @@ void ScreenEdit::HandleScreenMessage( const ScreenMessage SM )
 	else if( SM == SM_SaveSuccessful )
 	{
 		LOG->Trace( "Save successful." );
-		m_pSteps->SetSavedToDisk( true );
 		CopyToLastSave();
 		SetDirty( false );
 		SONGMAN->Invalidate( GAMESTATE->m_pCurSong );
@@ -2806,6 +2805,8 @@ void ScreenEdit::HandleMainMenuChoice( MainMenuChoice c, const vector<int> &iAns
 							break;
 						}
 
+						m_pSteps->SetSavedToDisk( true );
+
 						// HACK: clear undo, so "exit" below knows we don't need to save.
 						// This only works because important non-steps data can't be changed in
 						// home mode (BPMs, stops).

stepmania/src/Song.cpp

@@ -819,7 +819,31 @@ bool Song::SaveToSMFile( RString sPath, bool bSavingCache )
 	if( !bSavingCache && IsAFile(sPath) )
 		FileCopy( sPath, sPath + ".old" );
 
-	return NotesWriterSM::Write( sPath, *this, bSavingCache );
+	vector<Steps*> vpStepsToSave;
+	FOREACH_CONST( Steps*, m_vpSteps, s ) 
+	{
+		Steps *pSteps = *s;
+		if( pSteps->IsAutogen() )
+			continue; /* don't write autogen notes */
+
+		/* Only save steps that weren't loaded from a profile. */
+		if( pSteps->WasLoadedFromProfile() )
+			continue;
+
+		vpStepsToSave.push_back( pSteps );
+	}
+
+	if( !NotesWriterSM::Write(sPath, *this, vpStepsToSave, bSavingCache) )
+		return false;
+
+	if( !bSavingCache )
+	{
+		/* Mark these steps saved to disk. */
+		FOREACH( Steps*, vpStepsToSave, s )
+			(*s)->SetSavedToDisk( true );
+	}
+
+	return true;
 }
 
 bool Song::SaveToCacheFile()