From 74033e86bb44b9b4ad3fe8383ff71fdb73481a15 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Tue, 3 Nov 2009 14:11:01 +0000
Subject: [PATCH] Avoid redraws of the window under tooltip when its text is
 changed.

Backport the change of r59198 (and correction from r59235) from trunk.

Closes #10520.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@62542 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/msw/tooltip.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/msw/tooltip.cpp b/src/msw/tooltip.cpp
index af75de2935..ebf8535b2d 100644
--- a/src/msw/tooltip.cpp
+++ b/src/msw/tooltip.cpp
@@ -453,8 +453,10 @@ void wxToolTip::SetTip(const wxString& tip)
     {
         // update the tip text shown by the control
         wxToolInfo ti(GetHwndOf(m_window));
-        ti.lpszText = (wxChar *)m_text.c_str();
+        ti.lpszText = (wxChar *)wxT("");
+        (void)SendTooltipMessage(GetToolTipCtrl(), TTM_UPDATETIPTEXT, &ti);
 
+        ti.lpszText = (wxChar *)m_text.c_str();
         (void)SendTooltipMessage(GetToolTipCtrl(), TTM_UPDATETIPTEXT, &ti);
     }
 }