From d87a766214407ea34916ac0df2ace6458e057891 Mon Sep 17 00:00:00 2001
From: Paul Cornett <paulcor@users.noreply.github.com>
Date: Tue, 27 Jun 2017 09:28:05 -0700
Subject: [PATCH] Avoid showing hidden window during deferred show handling

See https://github.com/wxWidgets/wxWidgets/pull/512
---
 src/gtk/toplevel.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gtk/toplevel.cpp b/src/gtk/toplevel.cpp
index 85a6a3b755..42ca6f1ca0 100644
--- a/src/gtk/toplevel.cpp
+++ b/src/gtk/toplevel.cpp
@@ -1359,6 +1359,9 @@ void wxTopLevelWindowGTK::GTKUpdateDecorSize(const DecorSize& decorSize)
 #ifdef __WXGTK3__
         GTKSizeRevalidate();
 #endif
+        if (!m_isShown)
+            return;
+
         gtk_widget_show(m_widget);
 
 #ifdef __WXGTK3__