Some Changes flag management in movie objects

BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs

@@ -121,6 +121,8 @@ namespace BizHawk.Client.Common
 						});
 				}
 			}
+
+			Changes = false;
 			return true;
 		}
 

BizHawk.Client.Common/movie/bkm/BkmMovie.IO.cs

@@ -111,6 +111,7 @@ namespace BizHawk.Client.Common
 				BinarySavestate = Convert.FromBase64String(Header.SavestateBinaryBase64Blob);
 
 			Loaded = true;
+			_changes = false;
 			return true;
 		}
 
@@ -258,6 +259,8 @@ namespace BizHawk.Client.Common
 					}
 				}
 			}
+
+			_changes = false;
 		}
 	}
 }

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

@@ -176,6 +176,8 @@ namespace BizHawk.Client.Common
 					}
 				});
 			}
+
+			Changes = false;
 			return true;
 		}
 

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

@@ -43,6 +43,11 @@ namespace BizHawk.Client.Common
 			}
 		}
 
+		public void ClearChanges()
+		{
+			Changes = false;
+		}
+
 		public override void StartNewRecording()
 		{
 			LagLog.Clear();

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

@@ -127,6 +127,7 @@ namespace BizHawk.Client.EmuHawk
 			_tas = Global.MovieSession.Movie as TasMovie;
 			_tas.Filename = DefaultTasProjName(); // TODO don't do this, take over any mainform actions that can crash without a filename
 			_tas.PopulateWithDefaultHeaderValues();
+			_tas.ClearChanges();
 		}
 
 		private static string DefaultTasProjName()