A key in the "thumbnail" namespace for checking whether the thumbnail is outdated.
This attribute is true if the thumbnail is up-to-date with the file it represents,
and false if the file has been modified since the thumbnail was generated.
If G_FILE_ATTRIBUTE_THUMBNAILING_FAILED is true and this attribute is false,
it indicates that thumbnailing may be attempted again and may succeed.
A key in the "thumbnail" namespace for checking whether the thumbnail is outdated.
This attribute is true if the thumbnail is up-to-date with the file it represents, and false if the file has been modified since the thumbnail was generated.
If G_FILE_ATTRIBUTE_THUMBNAILING_FAILED is true and this attribute is false, it indicates that thumbnailing may be attempted again and may succeed.
Corresponding #GFileAttributeType is gio.types.FileAttributeType.Boolean.