Created attachment 246298 [details] [review]
Move property installation and various class initialization details to subclass_class_init()

Now GObject fires critical assertions if g_object_class_install_property() is
called outside of a class initializer.

Critical warnings cause test cases to abort, currently all of our test
cases fail because e_source_camel_generate_subtype() installs properties
on generated types after the class initializer finishes.

Attached patch moves the related class initialization code into the
class initializer.