The pgtk branch has been merged
This adds "pure GTK" support to Emacs, which offloads much of the complex GUI code into the toolkit library, and means Emacs doesn't have to care whether it's running on X11 or Wayland, because GTK can deal with that.
Here's the thread where the idea was originally proposed.
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emacs newb here, why did emacs ever even have it's own custom version of GTK?