Implement Enable property values "inactive" and "off" for uicontrol Edit (bug #57128) * BaseControl.cc (updatePalette): Call setColor() with additional argument of "QPalette::Active" and again with "QPalette::Inactive" so that colors are set only for specific roles. When Qt widget disabled it should now go gray. * BaseControl.cc (init): Call 'setEnabled (! properties.enable_is ("off"))' so that "Inactive" value still causes Qt Widget to be enabled. * BaseControl.cc (update): Call 'setEnabled (! properties.enable_is ("off"))' so that "Inactive" value still causes Qt Widget to be enabled. * EditControl.cc (init): Check Octave "Enable" property and call Qt setReadOnly() if value is "Inactive", but otherwise call Qt setEnabled() with property value. * EditControl.cc (updateSingleLine, updateMultiLine): Check Octave "Enable" property and call Qt setReadOnly() if value is "Inactive", but otherwise call Qt setEnabled() with property value.

%!test
%! ascii_filename = tempname ();
%! binary_filename = tempname ();
%! f = @ (x, y, varargin) x + y + varargin{1};
%! unwind_protect
%!   save ("-text", ascii_filename, "f");
%!   save ("-binary", binary_filename, "f");
%!   ascii = load (ascii_filename);
%!   binary = load (binary_filename);
%!   assert (f (1, 2, 3), ascii.f (1, 2, 3));
%!   assert (f (1, 2, 3), binary.f (1, 2, 3));
%! unwind_protect_cleanup
%!   unlink (ascii_filename);
%!   unlink (binary_filename);
%! end_unwind_protect

%!testif HAVE_HDF5
%! hdf5_filename = tempname ();
%! f = @ (x, y, varargin) x + y + varargin{1};
%! unwind_protect
%!   save ("-hdf5", hdf5_filename, "f");
%!   hdf5 = load (hdf5_filename);
%!   assert (f (1, 2, 3), hdf5.f (1, 2, 3));
%! unwind_protect_cleanup
%!   unlink (hdf5_filename);
%! end_unwind_protect