Init LuaFileList/LuaFunctionList outside platform impl. and pass in

now init'ing the lists at construction instead of mutating them afterwards

src/BizHawk.Client.Common/lua/LuaFileList.cs

@@ -9,7 +9,8 @@ namespace BizHawk.Client.Common
 	{
 		private bool _changes;
 
-		public Action ChangedCallback { get; set; }
+		private readonly Action ChangedCallback;
+
 		public bool Changes
 		{
 			get => _changes;
@@ -25,6 +26,13 @@ namespace BizHawk.Client.Common
 
 		public string Filename { get; set; } = "";
 
+		/// <remarks><paramref name="onChanged"/> will not be called when initialising from given <paramref name="collection"/>, only on subsequent mutations</remarks>
+		public LuaFileList(IReadOnlyCollection<LuaFile> collection, Action onChanged)
+		{
+			ChangedCallback = onChanged;
+			if (collection != null) AddRange(collection); // doesn't actually trigger callback as the superclass' Add is called; if this class is rewritten without `new` methods, something clever will need to be done, like a bool field _initialised
+		}
+
 		public void StopAllScripts()
 		{
 			ForEach(lf => lf.State = LuaFile.RunState.Disabled);

src/BizHawk.Client.Common/lua/LuaFunctionList.cs

@@ -10,10 +10,12 @@ namespace BizHawk.Client.Common
 	public class LuaFunctionList : IEnumerable<NamedLuaFunction>
 	{
 		private readonly List<NamedLuaFunction> _functions = new List<NamedLuaFunction>();
-		
-		public Action ChangedCallback { get; set; }
 
-		public NamedLuaFunction this[string guid] => 
+		private readonly Action Changed;
+
+		public LuaFunctionList(Action onChanged) => Changed = onChanged;
+
+		public NamedLuaFunction this[string guid] =>
 			_functions.FirstOrDefault(nlf => nlf.Guid.ToString() == guid);
 
 		public void Add(NamedLuaFunction nlf)
@@ -77,7 +79,5 @@ namespace BizHawk.Client.Common
 
 		public IEnumerator<NamedLuaFunction> GetEnumerator() => _functions.GetEnumerator();
 		IEnumerator IEnumerable.GetEnumerator() => _functions.GetEnumerator();
-
-		private void Changed() => ChangedCallback?.Invoke();
 	}
 }

src/BizHawk.Client.EmuHawk/tools/Lua/LuaConsole.cs

@@ -224,13 +224,22 @@ namespace BizHawk.Client.EmuHawk
 				}
 			}
 
-			var currentScripts = LuaImp?.ScriptList; // Temp fix for now
+			LuaFileList newScripts = new(LuaImp?.ScriptList, onChanged: SessionChangedCallback);
+			LuaFunctionList registeredFuncList = new(onChanged: UpdateRegisteredFunctionsDialog);
 			LuaImp = OSTailoredCode.IsUnixHost
-				? new UnixLuaLibraries()
-				: new Win32LuaLibraries(Emulator.ServiceProvider, (MainForm) MainForm, DisplayManager, InputManager, Config, Emulator, Game);
-			LuaImp.ScriptList.AddRange(currentScripts ?? Enumerable.Empty<LuaFile>());
-			LuaImp.ScriptList.ChangedCallback = SessionChangedCallback;
-			LuaImp.RegisteredFunctions.ChangedCallback = UpdateRegisteredFunctionsDialog;
+				? new UnixLuaLibraries(
+					newScripts,
+					registeredFuncList)
+				: new Win32LuaLibraries(
+					newScripts,
+					registeredFuncList,
+					Emulator.ServiceProvider,
+					(MainForm) MainForm, //HACK
+					DisplayManager,
+					InputManager,
+					Config,
+					Emulator,
+					Game);
 
 			InputBox.AutoCompleteCustomSource.AddRange(LuaImp.Docs.Select(a => $"{a.Library}.{a.Name}").ToArray());
 

src/BizHawk.Client.EmuHawk/tools/Lua/UnixLuaLibraries.cs

@@ -11,8 +11,6 @@ namespace BizHawk.Client.EmuHawk
 	/// </summary>
 	public sealed class UnixLuaLibraries : IPlatformLuaLibEnv
 	{
-		private static readonly LuaFunctionList EmptyLuaFunList = new LuaFunctionList();
-
 		public LuaDocumentation Docs { get; } = new LuaDocumentation();
 
 		public string EngineName => null;
@@ -21,9 +19,15 @@ namespace BizHawk.Client.EmuHawk
 
 		public bool IsUpdateSupressed { get; set; }
 
-		public LuaFunctionList RegisteredFunctions => EmptyLuaFunList;
+		public LuaFunctionList RegisteredFunctions { get; }
 
-		public LuaFileList ScriptList { get; } = new LuaFileList();
+		public LuaFileList ScriptList { get; }
+
+		public UnixLuaLibraries(LuaFileList scriptList, LuaFunctionList registeredFuncList)
+		{
+			RegisteredFunctions = registeredFuncList;
+			ScriptList = scriptList;
+		}
 
 		public void CallLoadStateEvent(string name) {}
 

src/BizHawk.Client.EmuHawk/tools/Lua/Win32LuaLibraries.cs

@@ -16,6 +16,8 @@ namespace BizHawk.Client.EmuHawk
 	public class Win32LuaLibraries : IPlatformLuaLibEnv
 	{
 		public Win32LuaLibraries(
+			LuaFileList scriptList,
+			LuaFunctionList registeredFuncList,
 			IEmulatorServiceProvider serviceProvider,
 			MainForm mainForm,
 			IDisplayManagerForApi displayManager,
@@ -47,6 +49,8 @@ namespace BizHawk.Client.EmuHawk
 			_inputManager = inputManager;
 			_mainForm = mainForm;
 			LuaWait = new AutoResetEvent(false);
+			RegisteredFunctions = registeredFuncList;
+			ScriptList = scriptList;
 			Docs.Clear();
 			_apiContainer = ApiManager.RestartLua(serviceProvider, LogToLuaConsole, _mainForm, _displayManager, _inputManager, _mainForm.MovieSession, _mainForm.Tools, config, emulator, game);
 
@@ -137,7 +141,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private EventWaitHandle LuaWait;
 
-		public LuaFileList ScriptList { get; } = new LuaFileList();
+		public LuaFileList ScriptList { get; }
 
 		private static void LogToLuaConsole(object outputs) => _logToLuaConsoleCallback(new[] { outputs });
 
@@ -159,7 +163,7 @@ namespace BizHawk.Client.EmuHawk
 
 		public bool FrameAdvanceRequested { get; private set; }
 
-		public LuaFunctionList RegisteredFunctions { get; } = new LuaFunctionList();
+		public LuaFunctionList RegisteredFunctions { get; }
 
 		public void CallSaveStateEvent(string name)
 		{