I’ve just done the stable glibmm 2.44.0 and gtkmm 3.16.0 releases with the usual bunch of API additions and deprecations to keep track of the glib and gtkmm API. Thanks to Kjell Ahlstedt in particular for his many well thought-out contributions.
I’ve been maintaining gtkmm since at least some time in 2001. That’s 14 years or so. Has any GNOME maintainer maintained one module for so long?