Move a function from mainform to moviesession

BizHawk.Client.Common/movie/MovieSession.cs

@@ -31,6 +31,20 @@ namespace BizHawk.Client.Common
 			}
 		}
 
+		public static bool IsValidMovieExtension(string ext)
+		{
+			if (ext.ToUpper() == "." + Global.Config.MovieExtension)
+			{
+				return true;
+			}
+			else if (ext.ToUpper() == ".TAS" || ext.ToUpper() == ".BKM")
+			{
+				return true;
+			}
+
+			return false;
+		}
+
 		public void LatchMultitrackPlayerInput(IController playerSource, MultitrackRewiringControllerAdapter rewiredSource)
 		{
 			if (_multiTrack.IsActive)

BizHawk.Client.EmuHawk/MainForm.Events.cs

@@ -2081,7 +2081,7 @@ namespace BizHawk.Client.EmuHawk
 					GlobalWin.Tools.LuaConsole.LoadLuaSession(filePaths[0]);
 				}
 			}
-			else if (IsValidMovieExtension(ext))
+			else if (MovieSession.IsValidMovieExtension(ext))
 			{
 				StartNewMovie(new Movie(filePaths[0]), false);
 			}

BizHawk.Client.EmuHawk/MainForm.cs

@@ -1527,20 +1527,6 @@ namespace BizHawk.Client.EmuHawk
 
 		}
 
-		private static bool IsValidMovieExtension(string ext)
-		{
-			if (ext.ToUpper() == "." + Global.Config.MovieExtension)
-			{
-				return true;
-			}
-			else if (ext.ToUpper() == ".TAS" || ext.ToUpper() == ".BKM")
-			{
-				return true;
-			}
-
-			return false;
-		}
-
 		private void LoadMoviesFromRecent(string path)
 		{
 			var movie = new Movie(path);