Is GTK_FILE_SYSTEM_ERROR public API?

["Murray Cumming" <murrayc murrayc com>]

GTK_FILE_SYSTEM_ERROR is defined in the semi-private gtkfilesystem.h
header, but it looks like the public FileChooser API can return GErrors of
type GTK_FILE_SYSTEM_ERROR sometimes. So, is this public or really
private? I mean, would an application developer ever check whether a
GError is a GTK_FILE_SYSTEM_ERROR?

I ask because we wrap GError types as separate C++ exception classes in
gtkmm.

Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com