set up GAMESTATE->m_fMusicSeconds earlier

stepmania/src/Background.cpp

@@ -444,8 +444,7 @@ int Background::FindBGSegmentForBeat( float fBeat ) const
 /* If the BG segment has changed, move focus to it.  Send Update() calls. */
 void Background::UpdateCurBGChange( float fCurrentTime )
 {
-	if( fCurrentTime == GameState::MUSIC_SECONDS_INVALID )
-		return; /* hasn't been updated yet */
+	ASSERT( fCurrentTime != GameState::MUSIC_SECONDS_INVALID );
 
 	if( m_aBGChanges.size() == 0 )
 		return;

stepmania/src/Foreground.cpp

@@ -52,9 +52,6 @@ void Foreground::LoadFromSong( const Song *pSong )
 
 void Foreground::Update( float fDeltaTime )
 {
-	if( GAMESTATE->m_fMusicSeconds == GameState::MUSIC_SECONDS_INVALID )
-		return; /* hasn't been updated yet */
-
 	/* Calls to Update() should *not* be scaled by music rate. Undo it. */
 	const float fRate = GAMESTATE->m_SongOptions.m_fMusicRate;
 

stepmania/src/ScreenGameplay.cpp

@@ -1040,6 +1040,11 @@ float ScreenGameplay::StartPlayingSong(float MinTimeToNotes, float MinTimeToMusi
 	SOUND->TakeOverSound( m_soundMusic, &GAMESTATE->m_pCurSong->m_Timing );
 	m_soundMusic = NULL; // SOUND owns it now
 
+	/* Make sure GAMESTATE->m_fMusicSeconds is set up. */
+	GAMESTATE->m_fMusicSeconds = -5000;
+	SOUND->Update(0);
+	ASSERT( GAMESTATE->m_fMusicSeconds > -4000 ); /* make sure the "fake timer" code doesn't trigger */
+
 	/* Return the amount of time until the first beat. */
 	return fFirstSecond - fStartSecond;
 }