Support for thumbnail size x-large and xx-large
Like defined in the spec (0.9): https://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html#DIRECTORY
See also thunar#606 (closed)
Like defined in the spec (0.9): https://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html#DIRECTORY
See also thunar#606 (closed)