graphic: 0.799
device: 0.733
vnc: 0.654
other: 0.651
socket: 0.633
network: 0.557
files: 0.506
PID: 0.503
debug: 0.496
semantic: 0.477
performance: 0.476
permissions: 0.413
boot: 0.345
KVM: 0.122

GTK+ UI has serious problems on macOS hosts
Description of problem:
The GTK+ UI simply does not work on macOS at this stage. One major reason is that there does not appear to be any regular polling of the (macOS) UI event loop. The Cocoa back-end for GTK [sets a custom event polling function in GLib's event handler](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gdk/macos/gdkmacoseventsource.c?ref_type=heads#L1089) but Qemu never actually calls GLib/GTK's event polling.

Thanks to @bonzini for discovering this as part of a [discussion on a patch generalising runloop event handling on macOS](https://patchew.org/QEMU/20241113142343.40832-1-phil@philjordan.eu/20241113142343.40832-2-phil@philjordan.eu/#CABgObfat1JwiBFNKHK6wwMkW5kgaqZfKJa=rW._5F9VvEdMWJR75A@mail.gmail.com).

There is also a reasonable chance that QEMU might not reliably call GTK+ functions from the main thread (thread 0), which causes problems when GTK then calls through to the native Cocoa APIs which must be called from thread 0.