Comment 12 for bug 1297688

Oh, and to add something possibly constructive: I know little about https://docs.enlightenment.org/stable/elementary/ - but it's another option. It doesn't seem to be that well-documented on Stackexchange, etc. It does have the general widgets and containers one expects: https://docs.enlightenment.org/stable/elementary/widgetslist.html and https://docs.enlightenment.org/stable/elementary/containerslist.html

It also supports Wayland, at least; see https://phab.enlightenment.org/w/wayland/ and https://fosdem.org/2014/schedule/event/enlightenment_standalone_wayland_compositor/attachments/slides/462/export/events/attachments/enlightenment_standalone_wayland_compositor/slides/462/Enlightenment_Wayland_Compositor.pdf for details, and in general, seems quite actively maintained.

For all this, it could have a lot of the same issues as GTK+ for all I know (it doesn't really have an independent existence as a project outside of Enlightenment, just as GTK+ doesn't these days outside GNOME), etc. I hadn't been aware of it, and perhaps other people weren't, either. It doesn't show up in the usual lists-of-widget-toolkits, but I think worth being aware of.