avoid flicker when setting the text which is the same as the current status bar pane value (patch 1669140) [backport from HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44666 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/statbr95.cpp

@@ -189,6 +189,12 @@ void wxStatusBar95::SetStatusText(const wxString& strText, int nField)
     wxCHECK_RET( (nField >= 0) && (nField < m_nFields),
                  _T("invalid statusbar field index") );
 
+    if ( strText == GetStatusText(nField) )
+    {
+       // don't call StatusBar_SetText() to avoid flicker
+       return;
+    }
+
     // Get field style, if any
     int style;
     if (m_statusStyles)