don't change the current project when auto-saving

every time auto-save ran, it would change the current project to
"recover.mmp". Now it doesn't do this because Song has
guiSaveProject(), guiSaveProjectAs(), and saveProjectFile().
(the latter is used for auto-save)

include/song.h

@@ -151,9 +151,10 @@ public:
 	// file management
 	void createNewProject();
 	void createNewProjectFromTemplate( const QString & _template );
-	void loadProject( const QString & _file_name );
-	bool saveProject();
-	bool saveProjectAs( const QString & _file_name );
+	void loadProject( const QString & _filename );
+	bool guiSaveProject();
+	bool guiSaveProjectAs( const QString & _filename );
+    bool saveProjectFile( const QString & _filename );
 	inline const QString & projectFileName() const
 	{
 		return m_fileName;

src/core/main.cpp

@@ -531,7 +531,7 @@ int main( int argc, char * * argv )
 		}
 		else
 		{
-			engine::getSong()->saveProjectAs( file_to_save );
+			engine::getSong()->saveProjectFile( file_to_save );
 			return( 0 );
 		}
 	}

src/core/song.cpp

@@ -994,10 +994,8 @@ void song::loadProject( const QString & _file_name )
 }
 
 
-
-
-// save current song
-bool song::saveProject()
+// only save current song as _filename and do nothing else
+bool song::saveProjectFile( const QString & _filename )
 {
 	multimediaProject mmp( multimediaProject::SongProject );
 
@@ -1006,7 +1004,6 @@ bool song::saveProject()
 	m_masterVolumeModel.saveSettings( mmp, mmp.head(), "mastervol" );
 	m_masterPitchModel.saveSettings( mmp, mmp.head(), "masterpitch" );
 
-
 	saveState( mmp, mmp.content() );
 
 	m_globalAutomationTrack->saveState( mmp, mmp.content() );
@@ -1024,8 +1021,17 @@ bool song::saveProject()
 
 	saveControllerStates( mmp, mmp.content() );
 
+    return mmp.writeFile( _filename );
+}
+
+
+
+// save current song and update the gui
+bool song::guiSaveProject()
+{
+	multimediaProject mmp( multimediaProject::SongProject );
 	m_fileName = mmp.nameWithExtension( m_fileName );
-	if( mmp.writeFile( m_fileName ) == true && engine::hasGUI() )
+	if( saveProjectFile( m_fileName ) && engine::hasGUI() )
 	{
 		textFloat::displayMessage( tr( "Project saved" ),
 					tr( "The project %1 is now saved."
@@ -1052,12 +1058,12 @@ bool song::saveProject()
 
 
 // save current song in given filename
-bool song::saveProjectAs( const QString & _file_name )
+bool song::guiSaveProjectAs( const QString & _file_name )
 {
 	QString o = m_oldFileName;
 	m_oldFileName = m_fileName;
 	m_fileName = _file_name;
-	if( saveProject() == false )
+	if( guiSaveProject() == false )
 	{
 		m_fileName = m_oldFileName;
 		m_oldFileName = o;

src/gui/MainWindow.cpp

@@ -1007,7 +1007,7 @@ bool MainWindow::saveProject()
 	}
 	else
 	{
-		engine::getSong()->saveProject();
+		engine::getSong()->guiSaveProject();
 	}
 	return true;
 }
@@ -1036,7 +1036,7 @@ bool MainWindow::saveProjectAs()
 	if( sfd.exec () == QFileDialog::Accepted &&
 		!sfd.selectedFiles().isEmpty() && sfd.selectedFiles()[0] != "" )
 	{
-		engine::getSong()->saveProjectAs(
+		engine::getSong()->guiSaveProjectAs(
 						sfd.selectedFiles()[0] );
 		return true;
 	}
@@ -1568,7 +1568,7 @@ void MainWindow::toggleRecordAutomation( bool _recording )
 void MainWindow::autoSave()
 {
 	QDir work(configManager::inst()->workingDir());
-	engine::getSong()->saveProjectAs(work.absoluteFilePath("recover.mmp"));
+	engine::getSong()->saveProjectFile(work.absoluteFilePath("recover.mmp"));
 }