Left clicking on a window only focuses the window if not processed.
wxControlContainer::SetFocus moved to wxControlContainerBase so that a container now focuses the first child even on wxGTK.
wxAuiBook is now a container, need for correct navigation on wxGTK.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48154 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775