Applied #15375 to stop event-sending in generic wxSpinCtrl ctor (eco)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74617 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
defer calling SetCanFocus() on wxGTK until after creation

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74618 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775