Cleanup FormsLuaLibrary.WindowClosed and usages

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

@@ -47,7 +47,6 @@ namespace BizHawk.Client.Common
 		public abstract (bool WaitForFrame, bool Terminated) ResumeScript(LuaFile lf);
 		public abstract void SpawnAndSetFileThread(string pathToLoad, LuaFile lf);
 		public abstract void StartLuaDrawing();
-		public abstract void WindowClosed(IntPtr handle);
 
 		public abstract void RunScheduledDisposes();
 	}

src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs

@@ -23,14 +23,8 @@ namespace BizHawk.Client.EmuHawk
 
 		public void WindowClosed(IntPtr handle)
 		{
-			foreach (var form in _luaForms)
-			{
-				if (form.Handle == handle)
-				{
-					_luaForms.Remove(form);
-					return;
-				}
-			}
+			var form = _luaForms.FirstOrDefault(form => form.Handle == handle);
+			if (form != null) _luaForms.Remove(form);
 		}
 
 		private LuaWinform GetForm(int formHandle)
@@ -352,7 +346,7 @@ namespace BizHawk.Client.EmuHawk
 			"newform", "creates a new default dialog, if both width and height are specified it will create a dialog of the specified size. If title is specified it will be the caption of the dialog, else the dialog caption will be 'Lua Dialog'. The function will return an int representing the handle of the dialog created.")]
 		public int NewForm(int? width = null, int? height = null, string title = null, LuaFunction onClose = null)
 		{
-			var form = new LuaWinform(CurrentFile, _luaLibsImpl);
+			var form = new LuaWinform(CurrentFile, WindowClosed);
 			_luaForms.Add(form);
 			if (width.HasValue && height.HasValue)
 			{

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

@@ -10,18 +10,16 @@ namespace BizHawk.Client.EmuHawk
 	{
 		public List<LuaEvent> ControlEvents { get; } = new List<LuaEvent>();
 
-		private readonly LuaLibraries _luaImp;
 		private readonly string _currentDirectory = Environment.CurrentDirectory;
 		private readonly LuaFile _ownerFile;
 
-		public LuaWinform(LuaFile ownerFile, LuaLibraries luaImp)
+		public LuaWinform(LuaFile ownerFile, Action<IntPtr> formsWindowClosedCallback)
 		{
 			_ownerFile = ownerFile;
-			_luaImp = luaImp;
 			InitializeComponent();
 			Icon = Properties.Resources.TextDocIcon;
 			StartPosition = FormStartPosition.CenterParent;
-			Closing += (o, e) => { _luaImp.WindowClosed(Handle); };
+			Closing += (o, e) => formsWindowClosedCallback(Handle);
 		}
 
 		public void DoLuaEvent(IntPtr handle)

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

@@ -52,9 +52,6 @@ namespace BizHawk.Client.EmuHawk
 		public override void StartLuaDrawing()
 		{
 		}
-		public override void WindowClosed(IntPtr handle)
-		{
-		}
 
 		public override void RunScheduledDisposes()
 		{

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

@@ -150,11 +150,6 @@ namespace BizHawk.Client.EmuHawk
 
 		public override LuaFunctionList RegisteredFunctions => EventsLibrary.RegisteredFunctions;
 
-		public override void WindowClosed(IntPtr handle)
-		{
-			FormsLibrary.WindowClosed(handle);
-		}
-
 		public override void CallSaveStateEvent(string name)
 		{
 			EventsLibrary.CallSaveStateEvent(name);