[gtk/wip/matthiasc/popup5: 144/186] Mention gtk_widget_get_surface in the migration guide

[Matthias Clasen <matthiasc src gnome org>]

commit ac9cec6e68c4e70f42433685fa32ffb5bde933ba
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon May 20 03:22:28 2019 +0000

    Mention gtk_widget_get_surface in the migration guide

 docs/reference/gtk/migrating-3to4.xml | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/docs/reference/gtk/migrating-3to4.xml b/docs/reference/gtk/migrating-3to4.xml
index b697dfb2d9..1db310271a 100644
--- a/docs/reference/gtk/migrating-3to4.xml
+++ b/docs/reference/gtk/migrating-3to4.xml
@@ -763,6 +763,15 @@
         gtk-builder-tool can assist with the rename in ui files.
       </para>
     </section>
+
+    <section>
+      <title>gtk_widget_get_surface has been removed</title>
+      <para>
+        gtk_widget_get_surface() has been removed.
+        Use gtk_native_get_surface() in combination with
+        gtk_widget_get_native() instead.
+      </para>
+    </section>
   </section>
 
 </chapter>