From b27aefacef51c7e7b2c0f79af1f6ff568b59c962 Mon Sep 17 00:00:00 2001
From: Paul Cornett <paulcor@users.noreply.github.com>
Date: Sat, 21 Nov 2020 08:09:23 -0800
Subject: [PATCH] Fix wxSplitterWindow sash appearance with some GTK themes

See #18981
---
 src/gtk/renderer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gtk/renderer.cpp b/src/gtk/renderer.cpp
index a197da3c1c..01f5d65828 100644
--- a/src/gtk/renderer.cpp
+++ b/src/gtk/renderer.cpp
@@ -449,6 +449,9 @@ wxRendererGTK::DrawSplitterSash(wxWindow* win,
 
 #ifdef __WXGTK3__
     wxGtkStyleContext sc(dc.GetContentScaleFactor());
+    sc.AddWindow();
+    gtk_render_background(sc, drawable, rect.x - x_diff, rect.y, rect.width, rect.height);
+
     sc.Add(GTK_TYPE_PANED, "paned", "pane-separator", NULL);
     if (gtk_check_version(3,20,0) == NULL)
         sc.Add("separator");