Registered Lua Functions dialog - update when a lua script unregisters a file, make dupating more robust to catch other possible scenarios where it failed to update

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

@@ -1,4 +1,5 @@
-using System.Collections;
+using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -9,11 +10,17 @@ 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] => 
 			_functions.FirstOrDefault(nlf => nlf.Guid.ToString() == guid);
 
-		public void Add(NamedLuaFunction nlf) => _functions.Add(nlf);
+		public void Add(NamedLuaFunction nlf)
+		{
+			_functions.Add(nlf);
+			Changed();
+		}
 
 		public bool Remove(NamedLuaFunction function, IEmulator emulator)
 		{
@@ -27,7 +34,13 @@ namespace BizHawk.Client.Common
 				emulator.AsDebuggable().MemoryCallbacks.Remove(function.MemCallback);
 			}
 
-			return _functions.Remove(function);
+			var result = _functions.Remove(function);
+			if (result)
+			{
+				Changed();
+			}
+
+			return result;
 		}
 
 		public void RemoveForFile(LuaFile file, IEmulator emulator)
@@ -40,6 +53,11 @@ namespace BizHawk.Client.Common
 			{
 				Remove(function, emulator);
 			}
+
+			if (functionsToRemove.Count != 0)
+			{
+				Changed();
+			}
 		}
 
 		public void Clear(IEmulator emulator)
@@ -56,10 +74,13 @@ namespace BizHawk.Client.Common
 			}
 
 			_functions.Clear();
+			Changed();
 		}
 
 		public IEnumerator<NamedLuaFunction> GetEnumerator() => _functions.GetEnumerator();
 		IEnumerator IEnumerable.GetEnumerator() => _functions.GetEnumerator();
+
+		private void Changed() => ChangedCallback?.Invoke();
 	}
 
 	public static class LuaFunctionListExtensions

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

@@ -195,6 +195,7 @@ namespace BizHawk.Client.EmuHawk
 			SetColumns();
 
 			splitContainer1.SetDistanceOrDefault(Settings.SplitDistance, _defaultSplitDistance);
+			LuaImp.RegisteredFunctions.ChangedCallback = UpdateRegisteredFunctionsDialog;
 		}
 
 		private void BranchesMarkersSplit_SplitterMoved(object sender, SplitterEventArgs e)
@@ -225,10 +226,7 @@ namespace BizHawk.Client.EmuHawk
 				foreach (var file in runningScripts)
 				{
 					LuaImp.CallExitEvent(file);
-
 					LuaImp.RegisteredFunctions.RemoveForFile(file, Emulator);
-					UpdateRegisteredFunctionsDialog();
-
 					file.Stop();
 				}
 			}
@@ -1009,8 +1007,7 @@ namespace BizHawk.Client.EmuHawk
 					LuaImp.RegisteredFunctions.RemoveForFile(item, Emulator);
 					LuaImp.ScriptList.Remove(item);
 				}
-				
+
-				UpdateRegisteredFunctionsDialog();
 				UpdateDialog();
 			}
 		}
@@ -1558,14 +1555,11 @@ namespace BizHawk.Client.EmuHawk
 			{
 				LuaImp.RegisteredFunctions.RemoveForFile(file, Emulator); // First remove any existing registered functions for this file
 				EnableLuaFile(file);
-				UpdateRegisteredFunctionsDialog();
 			}
 			else if (!file.Enabled && file.Thread != null)
 			{
 				LuaImp.CallExitEvent(file);
 				LuaImp.RegisteredFunctions.RemoveForFile(file, Emulator);
-				UpdateRegisteredFunctionsDialog();
-
 				LuaImp.CallExitEvent(file);
 				file.Stop();
 				ReDraw();