From 02759079971fa7aaa5e60cb23355f54fb56c1b5e Mon Sep 17 00:00:00 2001
From: Nikita Tsukanov <keks9n@gmail.com>
Date: Wed, 16 Jan 2019 22:02:31 +0300
Subject: [PATCH] [X11] Handle Expose events using dispatcher with Render
 priority

---
 src/Avalonia.X11/X11Window.cs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.X11/X11Window.cs b/src/Avalonia.X11/X11Window.cs
index 70d90d7b95..306897f20a 100644
--- a/src/Avalonia.X11/X11Window.cs
+++ b/src/Avalonia.X11/X11Window.cs
@@ -25,6 +25,7 @@ namespace Avalonia.X11
         private bool _invalidated;
         private XConfigureEvent? _configure;
         private Point? _configurePoint;
+        private bool _triggeredExpose;
         private IInputRoot _inputRoot;
         private readonly IMouseDevice _mouse;
         private readonly IKeyboardDevice _keyboard;
@@ -244,7 +245,17 @@ namespace Avalonia.X11
             else if (ev.type == XEventName.UnmapNotify)
                 _mapped = false;
             else if (ev.type == XEventName.Expose)
-                DoPaint();
+            {
+                if (!_triggeredExpose)
+                {
+                    _triggeredExpose = true;
+                    Dispatcher.UIThread.Post(() =>
+                    {
+                        _triggeredExpose = false;
+                        DoPaint();
+                    }, DispatcherPriority.Render);
+                }
+            }
             else if (ev.type == XEventName.FocusIn)
             {
                 if (ActivateTransientChildIfNeeded())