GtkWindow sometimes freezes when 'hide-on-close' is TRUE
In GNOME To Do, we have a plugin that sets
TRUE to allow To Do to run in background. However, when enabling this property, closing the window freezes it.
Oddly enough, it looks like GNOME To Do is running regularly except for the frozen window. Other mainloops are still running, and I see on gdb that EDS even runs a few asynchronous operations meanwhile.
Disabling this plugin, and thus setting
FALSE, properly destroys the window.