--- Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreX11.cpp.orig	2020-04-17 12:14:46.760037307 +0000
+++ Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreX11.cpp	2020-04-17 12:16:12.916705814 +0000
@@ -200,7 +200,7 @@
     cairo_fill(cr);
 
     cairo_restore(cr);
-
+    cairo_surface_flush(m_surface.get());
     return true;
 }