wxSTC need to reposition the scrollbar when recive size change event.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77850 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/stc/stc.cpp

@@ -4903,6 +4903,7 @@ void wxStyledTextCtrl::OnSize(wxSizeEvent& WXUNUSED(evt)) {
     if (m_swx) {
         wxSize sz = GetClientSize();
         m_swx->DoSize(sz.x, sz.y);
+        PositionScrollbars();
     }
 }