Keep track of the initial size that the window was created with, and

Keep track of the initial size that the window was created with, and
when the window is added to a sizer use that size with SetSizeHints.
This is to fix problems resulting from the previous change where
SetSizeHints was called with the initial size from CreateBase.

Also, Patch [ 934677 ] wxWindowBase::DoGetBestSize() should exclude hidden windows

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26777 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775