2.66.6 (stable):

Glib:
* Dispatcher: Don't warn when a Dispatcher is deleted while
  messages are pending.
  (Kjell Ahlstedt) Issue #108 (PBS)

Gio:
* NetworkMonitor::get_default(): Add refreturn
  (Kjell Ahlstedt) Issue #104 (ilya-fedin)

gmmproc:
* generate_wrap_init.pl.in: Disable warning C4273 on Visual Studio
  (Chun-wei Fan) Merge request !57

Meson build:
* Detect if we build from a git subtree
  (William Roy) Merge request gtkmm!72
  (Kjell Ahlstedt) Issue gtkmm#131 (William Roy)
* Don't copy files with configure_file()
  (Kjell Ahlstedt)