Changed preview length setting to occur when the special preview file is set in edit mode.

src/NotesLoaderSSC.cpp

@@ -1075,6 +1075,7 @@ bool SSCLoader::LoadEditFromMsd(const MsdFile &msd,
 
 	StepsTagInfo reused_steps_info(&*this, pSong, sEditFilePath, false);
 	reused_steps_info.for_load_edit= true;
+	reused_steps_info.timing= &stepsTiming;
 
 	for(unsigned int i = 0; i < msd.GetNumValues(); ++i)
 	{
@@ -1088,7 +1089,7 @@ bool SSCLoader::LoadEditFromMsd(const MsdFile &msd,
 			reused_steps_info.params= &sParams;
 			steps_handler_map_t::iterator handler=
 				parser_helper.steps_tag_handlers.find(sValueName);
-			if(handler != parser_helper.steps_tag_handlers.end())
+			if(pNewNotes != NULL && handler != parser_helper.steps_tag_handlers.end())
 			{
 				handler->second(reused_steps_info);
 			}
@@ -1180,6 +1181,7 @@ bool SSCLoader::LoadEditFromMsd(const MsdFile &msd,
 				this->SetSongTitle(sParams[1]);
 				sSongFullTitle.Replace('\\', '/');
 				pSong = SONGMAN->FindSong(sSongFullTitle);
+				reused_steps_info.song= pSong;
 				if(pSong == NULL)
 				{
 					LOG->UserLog("Edit file", sEditFilePath,

src/ScreenEdit.cpp

@@ -20,6 +20,7 @@
 #include "NotesWriterSM.h"
 #include "PrefsManager.h"
 #include "RageSoundManager.h"
+#include "RageSoundReader_FileReader.h"
 #include "RageInput.h"
 #include "RageLog.h"
 #include "ScreenDimensions.h"
@@ -4457,7 +4458,25 @@ static void ChangeCredit( const RString &sNew )
 static void ChangePreview(const RString& sNew)
 {
 	Song* pSong = GAMESTATE->m_pCurSong;
+	if(!sNew.empty())
+	{
+		RString error;
+		RageSoundReader* sample= RageSoundReader_FileReader::OpenFile(pSong->GetPreviewMusicPath(), error);
+		if(sample == NULL)
+		{
+			LOG->UserLog( "Preview file", pSong->GetPreviewMusicPath(), "couldn't be opened: %s", error.c_str() );
+		}
+		else
+		{
+			pSong->m_fMusicSampleLengthSeconds= sample->GetLength() / 1000.0f;
 			pSong->m_PreviewFile= sNew;
+			delete sample;
+		}
+	}
+	else
+	{
+		pSong->m_PreviewFile= sNew;
+	}
 }
 
 static void ChangeMainTitleTranslit( const RString &sNew )

src/Song.cpp

@@ -627,22 +627,6 @@ void Song::TidyUpData( bool fromCache, bool /* duringCache */ )
 					 m_fMusicLengthSeconds);
 	}
 
-	if(!m_PreviewFile.empty() && m_fMusicSampleStartSeconds == -1)
-	{
-		RString error;
-		RageSoundReader* sample= RageSoundReader_FileReader::OpenFile(GetPreviewMusicPath(), error);
-		if(sample == NULL)
-		{
-			LOG->UserLog( "Preview file", GetPreviewMusicPath(), "couldn't be opened: %s", error.c_str() );
-			m_PreviewFile= "";
-		}
-		else
-		{
-			m_fMusicSampleLengthSeconds= sample->GetLength() / 1000.0f;
-			delete sample;
-		}
-	}
-
 	if( m_fMusicLengthSeconds < 0 )
 	{
 		LOG->UserLog("Sound file",