From 1b61975fba2a9df81e8eb9178bc289a3ba12adb6 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Mon, 2 Mar 2015 14:36:13 +0100
Subject: [PATCH] Avoid refreshing not currently visible items in generic
 wxListCtrl.

This is useless at best and resulted in GTK+ warnings because we ended up
(somehow -- is there another bug lurking here?) with negative items height in
this case.

Closes #16862.
---
 src/generic/listctrl.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/generic/listctrl.cpp b/src/generic/listctrl.cpp
index e92374c6a9..2920a9b892 100644
--- a/src/generic/listctrl.cpp
+++ b/src/generic/listctrl.cpp
@@ -1935,6 +1935,13 @@ void wxListMainWindow::RefreshLines( size_t lineFrom, size_t lineTo )
         size_t visibleFrom, visibleTo;
         GetVisibleLinesRange(&visibleFrom, &visibleTo);
 
+        if ( lineFrom > visibleTo || lineTo < visibleFrom )
+        {
+            // None of these lines are currently visible at all, don't bother
+            // doing anything.
+            return;
+        }
+
         if ( lineFrom < visibleFrom )
             lineFrom = visibleFrom;
         if ( lineTo > visibleTo )