tastudio: load projects without branch state info.

fix some other crashes, kill selection when loading a file.

BizHawk.Client.Common/movie/tasproj/TasMovie.cs

@@ -82,8 +82,21 @@ namespace BizHawk.Client.Common
 		public bool BindMarkersToInput { get; set; }
 		public bool UseInputCache { get; set; }
 		public int BranchCount { get { return Branches.Count; } }
-		public TasBranch GetBranch(int index) { return Branches[index]; }
-		public int BranchHashByIndex(int index) { return Branches[index].UniqueIdentifier.GetHashCode(); }
+		public TasBranch GetBranch(int index)
+		{
+			if (index >= Branches.Count)
+				return null; // are we allowed?
+			else
+				return Branches[index];
+		}
+
+		public int BranchHashByIndex(int index)
+		{
+			if (index >= Branches.Count)
+				return -1;
+			else
+				return Branches[index].UniqueIdentifier.GetHashCode();
+		}
 
 		public int BranchIndexByHash(int hash)
 		{

BizHawk.Client.Common/movie/tasproj/TasStateManager.cs

@@ -588,6 +588,9 @@ namespace BizHawk.Client.Common
 			}
 			//}
 
+			if (br.PeekChar() == -1) // at least don't crash when loading an old project
+				return;
+
 			currentBranch = br.ReadInt32();
 			int c = br.ReadInt32();
 			BranchStates = new SortedList<int, SortedList<int, StateManagerState>>(c);

BizHawk.Client.EmuHawk/tools/TAStudio/BookmarksBranchesBox.cs

@@ -98,8 +98,10 @@ namespace BizHawk.Client.EmuHawk
 
 		private void QueryItemBkColor(int index, InputRoll.RollColumn column, ref Color color)
 		{
-			var record = Tastudio.CurrentTasMovie[GetBranch(index).Frame];
-
+			TasBranch branch = GetBranch(index);
+			if (branch != null)
+			{
+				var record = Tastudio.CurrentTasMovie[branch.Frame];
 				if (index == CurrentBranch)
 					color = TAStudio.CurrentFrame_InputLog; // SystemColors.HotTrack;
 				else if (record.Lagged.HasValue)
@@ -113,6 +115,7 @@ namespace BizHawk.Client.EmuHawk
 						color = TAStudio.GreenZone_InputLog;
 					}
 				}
+			}
 
 			// Highlight the branch cell a little, if hovering over it
 			if (BranchView.CurrentCellIsDataCell &&

BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs

@@ -433,7 +433,11 @@ namespace BizHawk.Client.EmuHawk
 			if (!HandleMovieLoadStuff(newMovie))
 				return false;
 			
-			BookMarkControl.UpdateValues();
+			// clear all selections
+			TasView.DeselectAll();
+			BookMarkControl.Restart();
+			MarkerControl.Restart();
+
 			RefreshDialog();
 			return true;
 		}