From a2ff49eeeb2760727ada90eba49f6eb901725f9d Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 10 Nov 2019 00:35:07 +0100
Subject: [PATCH] Initialize wxWindowDCImpl::m_window for hidden windows too

Ensure that we set m_window in case of early return from wxWindowDCImpl
ctor, so that using e.g. wxDC::GetSize() works for wxClientDC created
for windows that hadn't been realized yet.

It might be possible to avoid this early return completely as the
comment explaining why we're doing it seems to be out of date: our
SetBackground() doesn't call wxWindow::SetBackground() (and it would be
exceedingly strange if it did), but for now just the bug without
changing anything else.

Closes #18569.
---
 src/gtk/dcclient.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/gtk/dcclient.cpp b/src/gtk/dcclient.cpp
index 66f0e14f65..d879b2f9e0 100644
--- a/src/gtk/dcclient.cpp
+++ b/src/gtk/dcclient.cpp
@@ -314,6 +314,8 @@ wxWindowDCImpl::wxWindowDCImpl( wxDC *owner, wxWindow *window ) :
          // Don't report problems as per MSW.
          m_ok = true;
 
+         m_window = window;
+
          return;
     }