move timeLine marker in Piano Roll and autoscroll when recording while playing song (closes #2486334) (stable backport)

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/branches/lmms/stable-0.4@2054 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/piano_roll.h

@@ -135,6 +135,7 @@ protected slots:
 	void deleteSelectedNotes( void );
 
 	void updatePosition( const midiTime & _t );
+	void updatePositionAccompany( const midiTime & _t );
 
 	void zoomingChanged( void );
 	void quantizeChanged( void );
@@ -184,6 +185,8 @@ private:
 	pianoRoll( const pianoRoll & );
 	virtual ~pianoRoll();
 
+	void autoScroll( const midiTime & _t );
+
 	midiTime newNoteLen( void ) const;
 	
 	void shiftPos(int amount);