A key in the "thumbnail" namespace for checking whether the thumbnail is outdated.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A key in the "thumbnail" namespace for checking whether the thumbnail is outdated.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