add AppHasFocus

stepmania/src/StepMania.cpp

@@ -1461,6 +1461,11 @@ void FocusChanged( bool bHasFocus )
 	}
 }
 
+bool AppHasFocus()
+{
+	return g_bHasFocus;
+}
+
 static void CheckSkips( float fDeltaTime )
 {
 	if( !PREFSMAN->m_bLogSkips )

stepmania/src/StepMania.h

@@ -16,6 +16,7 @@ void ResetGame();
 void SaveGamePrefsToDisk();
 void ChangeCurrentGame( const Game* g );
 void FocusChanged( bool bHasFocus );
+bool AppHasFocus();
 
 // If successful, return filename of screenshot in sDir, else return ""
 CString SaveScreenshot( CString sDir, bool bSaveCompressed, bool bMakeSignature, int iIndex = -1 );