From 36e9576d4216e40c2b7a979a7a3f8a610895744d Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Fri, 6 Aug 2021 21:01:18 +0200
Subject: [PATCH] Fix not refreshing wxListCtrl properly under macOS

Refresh() called from inside wxEVT_PAINT handler doesn't seem to have
any effect, so use CallAfter() to call it slightly later instead.

Closes #19139.
---
 src/generic/listctrl.cpp | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/generic/listctrl.cpp b/src/generic/listctrl.cpp
index 3ba6b9576c..8e903e6772 100644
--- a/src/generic/listctrl.cpp
+++ b/src/generic/listctrl.cpp
@@ -2058,7 +2058,19 @@ void wxListMainWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
     }
 
     if ( m_dirty )
-        RecalculatePositions( false );
+    {
+        // Calling Refresh() from inside OnPaint() doesn't work under macOS, so
+        // don't do it immediately...
+        RecalculatePositions(true /* no refresh */);
+
+        // ... but schedule it for later.
+        CallAfter(&wxWindow::Refresh, true, (const wxRect*)NULL);
+
+        // Don't bother redoing the relayout again the next time nor redrawing
+        // now, as we'll be refresh soon anyhow.
+        m_dirty = false;
+        return;
+    }
 
     GetListCtrl()->PrepareDC( dc );