Add option to enable/disable input focus proxy for X11. (#13273)

* Add option to enable/disable input focus proxy for X11.

* use list instead

src/Avalonia.X11/X11Platform.cs

@@ -284,6 +284,12 @@ namespace Avalonia
         /// on their input devices by using sequences of characters or mouse operations that are natively available on their input devices.
         /// </remarks>
         public bool? EnableIme { get; set; }
+
+        /// <summary>
+        /// Determines whether to use Input Focus Proxy.
+        /// The default value is false.
+        /// </summary> 
+        public bool EnableInputFocusProxy { get; set; }
         
         /// <summary>
         /// Determines whether to enable support for the

src/Avalonia.X11/X11Window.cs

@@ -64,7 +64,7 @@ namespace Avalonia.X11
         private RawEventGrouper? _rawEventGrouper;
         private bool _useRenderWindow = false;
         private bool _usePositioningFlags = false;
-        private X11FocusProxy _focusProxy;
+        private X11FocusProxy? _focusProxy;
 
         private enum XSyncState
         {
@@ -158,8 +158,13 @@ namespace Avalonia.X11
                 _renderHandle = _handle;
 
             Handle = new PlatformHandle(_handle, "XID");
-            _focusProxy = new X11FocusProxy(platform, _handle, OnEvent);
-            SetWmClass(_focusProxy._handle, "FocusProxy");
+            
+            if (platform.Options.EnableInputFocusProxy)
+            {
+                _focusProxy = new X11FocusProxy(platform, _handle, OnEvent);
+                SetWmClass(_focusProxy._handle, "FocusProxy");
+            }
+            
             _realSize = new PixelSize(defaultWidth, defaultHeight);
             platform.Windows[_handle] = OnEvent;
             XEventMask ignoredMask = XEventMask.SubstructureRedirectMask
@@ -214,9 +219,14 @@ namespace Avalonia.X11
                 _nativeMenuExporter = DBusMenuExporter.TryCreateTopLevelNativeMenu(_handle);
             _nativeControlHost = new X11NativeControlHost(_platform, this);
             InitializeIme();
+
+            var data = new List<IntPtr> { _x11.Atoms.WM_DELETE_WINDOW, _x11.Atoms._NET_WM_SYNC_REQUEST };
             
+            if(platform.Options.EnableInputFocusProxy)
+                data.Add(_x11.Atoms.WM_TAKE_FOCUS);
+
             XChangeProperty(_x11.Display, _handle, _x11.Atoms.WM_PROTOCOLS, _x11.Atoms.XA_ATOM, 32,
-                PropertyMode.Replace, new[] { _x11.Atoms.WM_DELETE_WINDOW, _x11.Atoms.WM_TAKE_FOCUS, _x11.Atoms._NET_WM_SYNC_REQUEST }, 3);
+                    PropertyMode.Replace, data.ToArray(), data.Count);
 
             if (_x11.HasXSync)
             {
@@ -564,7 +574,7 @@ namespace Avalonia.X11
                         _xSyncValue.Hi = ev.ClientMessageEvent.ptr4.ToInt32();
                         _xSyncState = XSyncState.WaitConfigure;
                     }
-                    else if (ev.ClientMessageEvent.ptr1 == _x11.Atoms.WM_TAKE_FOCUS)
+                    else if (ev.ClientMessageEvent.ptr1 == _x11.Atoms.WM_TAKE_FOCUS && _platform.Options.EnableInputFocusProxy)
                     {
                         IntPtr time = ev.ClientMessageEvent.ptr2;
                         XSetInputFocus(_x11.Display, _focusProxy._handle, RevertTo.Parent, time);
@@ -953,7 +963,7 @@ namespace Avalonia.X11
                 _renderHandle = IntPtr.Zero;
             }
 
-            _focusProxy.Cleanup();
+            _focusProxy?.Cleanup();
         }
 
         private bool ActivateTransientChildIfNeeded()