GTK+ 4 checklist (2019)
wiki.gnome.org
wiki.gnome.org
gtk4-demo
to see its appearance. GDK_BACKEND=wayland might be needed for I found x11 backend's pretty sluggish.Debian users may install https://packages.debian.org/experimental/gtk-4-examples
A pox on you, Gnome developers! You yet again broke the colour scheme. It comes as no surprise, you did so with (at least) versions 3.2, 3.4, 3.6, 3.16, 3.18… You have been doing that over such a long time (>9 years) and so often that even seasoned desktop environment developers working on infrastructure throw up their hands and walk away in disgust. See https://github.com/QtCurve/qtcurve-gtk3 and https://igurublog.wordpress.com/2012/11/05/gnome-et-al-rotti...
Gnome developers truly deserve the moniker of shame "cascade of attention deficit teenagers" because you absolutely do not take responsibility for the outcome of your decisions and refuse to acknowledge that environments other than Gnome exist where end users might want to run Gtk applications (e.g. Firefox).
[0] https://mail.gnome.org/archives/gtk-devel-list/2019-February...
Wow! That's what I always wanted in a free desktop widget toolkit. Cool.
Edit: https://kean.github.io/post/swiftui-layout-system
Sounds like a near copy of the JavaFX layout system!
It sounds like the constraint based approach had problems with unsatisfiable or unstable solutions to the equations.