Rename LAST_PROPERTY to PROP_LAST.
Use GObject macros for declaration.
Use GObject macros for definition.
Move all internal property handling together.
Move class init/finalize together with the rest of GObject implementation.
Move callbacks together.
Move helpers together (or inline).
Add g_return_if_fail(PIDGIN_IS_MINI_DIALOG(...)) on public API.

Compile and connect an account with some buddy requests.