A key in the "thumbnail" namespace for checking whether the thumbnail is outdated.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 G_FILE_ATTRIBUTE_TYPE_BOOLEAN.

enum FILE_ATTRIBUTE_THUMBNAIL_IS_VALID = "thumbnail::is-valid";