file-roller reports wrong content size for .gz file

[D_Belgium]

.gz file size is 5.1 GB (5,063,869,339 bytes)
file-roller reports content size 3.9GB and compression ratio 0.77
after extracting, the actual file size is 54.9 GB (54,940,270,592 bytes)

version and system info:
file-roller 3.10.2.1-0ubuntu4.1
ubuntu 14.04.3 LTS
Memory 3.9 GiB
Processor AMD Athlon(tm) II X4 620
OS type 64-bit

Steps to reproduce:
go to: http://dumps.wikimedia.org/wikidatawiki/20151002/
download file: wikidatawiki-20151002-pages-logging.xml.gz
(file with description "Log events to all pages and users.")
open file with archive manager, it shows:
wikidatawiki-20151002-pages-logging.xml 3.9 GB
extract the file and check actual size: 54.9 GB

[D_Belgium (diedtwitter)]

Seems that this is an inherent limitation of the gzip file format
http://lists.gnu.org/archive/html/bug-gzip/2010-03/msg00009.html

I guess this should be closed as "not a bug"? I don't know how to do that however...