The issue is that the pure GTK port doesn’t have those functions that are based on Xlib such as frame properties that come from X11. Some feature specific to X11 that can be implemented purely with GTK are not implemented such as outer window id’s (I have a patch for that). So in theory the pure GTK windowing system could replace the GTK with X11 calls if it optionally allows the call of functions that depend on X11 if requested.

Pure GTK also allows the use of GTK input methods besides the better high dpi scaling.

It’s feature complete but limited because Wayland is limited.

For example there’s no way for Emacs to know which frames are currently visible.

The bookmark file contains information when it was last modified.

It did look similar like the Gnus newsrc which also mixes configuration and runtime information.

I’m talking about the Emacs internal bookmarks not browser bookmarks.

Please use a pastebin to post the backtrace. Run thread apply all bt to get the backtrace from all threads.

Doesn’t seem to work with PGTK for me.