More fixes for dsound playing code and a bit for spectrum rendering

Originally committed to SVN as r732.

aegisub/audio_display.cpp

@@ -534,11 +534,7 @@ void AudioDisplay::DrawSpectrum(wxDC &finaldc,bool weak) {
 		spectrumDisplay = new wxBitmap(imgobj);
 	}
 
-	if (hasSel && selStartCap < selEndCap &&
-		((selStartCap > Position && selStartCap < Position+w) ||
-		(selEndCap > Position && selEndCap < Position+w) ||
-		(selStartCap < Position && selEndCap > Position+w)) &&
-		!spectrumDisplaySelected) {
+	if (hasSel && selStartCap < selEndCap && !spectrumDisplaySelected) {
 		// There is a visible selection and we don't have a rendered one
 		// This should be done regardless whether we're "weak" or not
 		// Assume a few things were already set up when things were first rendered though

aegisub/audio_player_dsound.cpp

@@ -295,8 +295,10 @@ void DirectSoundPlayer::Stop(bool timerToo) {
 	offset = 0;
 
 	// Close event handle
-	if (notificationEvent)
+	if (notificationEvent) {
 		CloseHandle(notificationEvent);
+		notificationEvent = 0;
+	}
 
 	// Stop timer
 	if (timerToo && displayTimer) {