From d8c159fbfdd96c987da9b325c3b47407d0f1f184 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Mon, 28 Oct 2002 20:17:53 +0000
Subject: [PATCH] don't crash if IsVisible() is called for the hidden virtual
 root

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17642 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/msw/treectrl.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/msw/treectrl.cpp b/src/msw/treectrl.cpp
index d91e98645f..efad5e8001 100644
--- a/src/msw/treectrl.cpp
+++ b/src/msw/treectrl.cpp
@@ -1240,6 +1240,12 @@ void wxTreeCtrl::SetItemFont(const wxTreeItemId& item, const wxFont& font)
 
 bool wxTreeCtrl::IsVisible(const wxTreeItemId& item) const
 {
+    if ( item == wxTreeItemId(TVI_ROOT) )
+    {
+        // virtual (hidden) root is never visible
+        return FALSE;
+    }
+
     // Bug in Gnu-Win32 headers, so don't use the macro TreeView_GetItemRect
     RECT rect;