Add the possibility to disable invisible wxDataViewCtrl items.
Add new wxDataViewModel::IsEnabled() and wxDataViewListStore::IsEnabledByRow()
methods and implement support for actually disabling the items in wxOSX/Cocoa
native implementation of wxDataViewCtrl and limited support for it in the
generic version.
We need to implement this in wxGTK using GtkCellRenderer "sensitive" propriety
later.
Closes #12686.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66403
c3d73ce0-8a6f-49c7-b76d-
6d57e0e08775