Gtk and Gtkmm 4.0 released as stable :)

https://blog.gtk.org/
https://mail.gnome.org/archives/gtkmm-list/2020-December/msg00013.html

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Good news but compatibility with older OS before all :stuck_out_tongue:

For that we have 1.4.x – that has a LOT of gtk 2.x code style :stuck_out_tongue: