The children layout will almost always depend on the layout direction, so redo it when the latter changes. In particular, this fixes changing the layout of wxSpinCtrlDouble under MSW. See #11583. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77756 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775