applied patch 1675101 - reduce flicker

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44776 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/aui/auibook.cpp

@@ -1935,7 +1935,8 @@ void wxAuiTabContainer::DoShowHide()
     for (i = 0; i < page_count; ++i)
     {
         wxAuiNotebookPage& page = pages.Item(i);
-        ShowWnd(page.window, page.active);
+        if (!page.active)
+            ShowWnd(page.window, false);
     }
 }