tastudio: stop updating splicer after every new cell is appended.

quick fix to #597.
fix crash when pasting input beyond movie length. todo: make input log append like PasteInsert does.

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

@@ -266,6 +266,8 @@ namespace BizHawk.Client.Common
 			var states = inputStates.ToList();
 			for (int i = 0; i < states.Count; i++)
 			{
+				if (_log.Count <= frame + i)
+					break;
 				lg.SetSource(states[i]);
 				_log[frame + i] = lg.GenerateLogEntry();
 			}

BizHawk.Client.EmuHawk/CustomControls/InputRoll.cs

@@ -1646,7 +1646,7 @@ namespace BizHawk.Client.EmuHawk
 
 				if (SelectedIndexChanged != null)
 				{
-					SelectedIndexChanged(this, new EventArgs());
+					//SelectedIndexChanged(this, new EventArgs());
 				}
 			}
 		}

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

@@ -704,6 +704,7 @@ namespace BizHawk.Client.EmuHawk
 					{
 						TasView.SelectRow(i, _selectionDragState);
 					}
+					SetSplicer();
 				}
 			}
 

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

@@ -258,7 +258,7 @@ namespace BizHawk.Client.EmuHawk
 				{
 					TasView.SelectRow(i, true);
 				}
-
+				SetSplicer();
 				RefreshTasView();
 			}
 		}
@@ -270,7 +270,7 @@ namespace BizHawk.Client.EmuHawk
 			{
 				TasView.SelectRow(item.Frame, true);
 			}
-
+			SetSplicer();
 			RefreshTasView();
 		}
 
@@ -285,6 +285,8 @@ namespace BizHawk.Client.EmuHawk
 				foreach (var index in list)
 				{
 					var input = CurrentTasMovie.GetInputState(index);
+					if (input == null)
+						break;
 					_tasClipboard.Add(new TasClipboardEntry(index, input));
 					var lg = CurrentTasMovie.LogGeneratorInstance();
 					lg.SetSource(input);