gtk - garbage toolkit

GTk is bloated trash due to its dependencies like GLib, cairo and DBus.
Qt4/5 is equally bloated C++ garbage.

OpenVG used to be a saner alternative to cairo, but it's fallen by the wayside and support for it in Gallium has been dropped and might end up getting removed from Mesa in the future.

So if you were to throw away gtk and qt, and starting from first principles, how would you go about building a minimalist themable widget library on top of GL/GLES for Wayland that can be used to build a desktop where applications have a common look-and-feel?

Dunno about the others, but the dumbest thing IMHO about GTK is that it doesn't use the standard file dialogs on Windows or OSX. I understand that it's pretty much impossible for a cross-platform GUI toolkit to feel "native" but holy shit, you have to draw the line somewhere.

Speaking of which, there really should have been some kind of freedesktop.org standard that allows you to register your own file dialog (either by creating a separate process, or with some kind of bloated bullshit IPC solution). It's really dumb that GTK and Qt apps have to use different file dialogs.