Subtitle & Comment editors - clear out old comments & subs before saving the new list

BizHawk.MultiClient/movie/EditCommentsForm.cs

@@ -40,6 +40,7 @@ namespace BizHawk.MultiClient
 		{
 			if (!ReadOnly)
 			{
+				selectedMovie.ClearComments();
 				for (int x = 0; x < CommentGrid.Rows.Count - 1; x++)
 				{
 					DataGridViewCell c = CommentGrid.Rows[x].Cells[0];

BizHawk.MultiClient/movie/EditSubtitlesForm.cs

@@ -47,7 +47,7 @@ namespace BizHawk.MultiClient
 		{
 			if (!ReadOnly)
 			{
-				//Save subtitles to movie object & write to disk
+				selectedMovie.Subtitles.ClearSubtitles();
 				for (int x = 0; x < SubGrid.Rows.Count - 1; x++)
 				{
 					Subtitle s = new Subtitle();

BizHawk.MultiClient/movie/Movie.cs

@@ -741,5 +741,10 @@ namespace BizHawk.MultiClient
 		{
 			Header.Comments.Add(comment);
 		}
+
+		public void ClearComments()
+		{
+			Header.Comments.Clear();
+		}
 	}
 }

BizHawk.MultiClient/movie/SubtitleList.cs

@@ -121,5 +121,10 @@ namespace BizHawk.MultiClient
 		{
 			subs.Add(s);
 		}
+
+		public void ClearSubtitles()
+		{
+			subs.Clear();
+		}
 	}
 }