Re: "concerns" ... over Gtk?
> That said, why is XFCE (and MATE?) taking over those kind of duties for the toolkit they rely on characterized as a "concern"?
This is solely me expressing my concern.
Gtk 1 and Gtk 2 are, AFAIK, basically dead now.
MATE and Xfce moved to Gtk 3 a few versions ago, at considerable effort over a period of years.
MATE, of course, is a fork of GNOME 2.32 released in 2010.
By the time they moved to Gtk 3, the Gtk maintainers had moved on to Gtk 4.
The small MATE team is trying to maintain the entire codebase of a desktop all of whose original developers (that is, doing it as their day job) have moved on to a new version. It is literal abandonware.
MATE could potentially drop all the accessory apps and just maintain the panel, file manager etc. because there are replacements for all the other bits from other projects.
This is what is happening to Unity in Ubuntu Unity these days. Ironically in quite a few cases by moving to MATE accessories.
But Gtk has moved on and the price of moving to Gtk 4 is pretty high. No more themes for instance. Decreasing or no support for accessibility (currently anyway) and I would guess no support for title bars, menu trees, and so on as GNOME is dropping all that stuff. Gtk is discussing dropping X11 support at some point soon, too.
https://www.theregister.com/2022/07/05/gtk_5_might_drop_x11/
It leaves them in a bit of a pickle, but right now, with efforts to adopt Wayland and so on nobody much is discussing this.