I tested this package:
$ sha1sum light-themes_16.10+18.04.20181005-0ubuntu1_all.deb d05d75088b41c7594bf3e4e32879d8950983caec light-themes_16.10+18.04.20181005-0ubuntu1_all.deb
And the bug is indeed fixed for me in virt-manager.
I tested this package:
$ sha1sum light-themes_ 16.10+18. 04.20181005- 0ubuntu1_ all.deb 94bf3e4e32879d8 950983caec light-themes_ 16.10+18. 04.20181005- 0ubuntu1_ all.deb
d05d75088b41c75
And the bug is indeed fixed for me in virt-manager.