Bug#886861: ring: abort with assertion failed: (_gtk_rbtree_is_nil (tree->root))

[Amy Kos]

> Did any of these improvements reach Debian stable?  As far as I can see
> here, the ring version is still 20161221.2.7bd7d91~dfsg1-1.

Not at that time.

Back then stretch was stable, now it is buster.
Latest stretch backports package is from late 2017.

Alexandre referred to early 2019 upload, which is now in stable, testing and unstable.