[Telepathy] [Bug 15092] New: Can't subclass a class which is using the group mixin

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=15092

           Summary: Can't subclass a class which is using the group mixin
           Product: Telepathy
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: telepathy-glib
        AssignedTo: telepathy at lists.freedesktop.org
        ReportedBy: guillaume.desmottes at collabora.co.uk


If you try to create a class FooMucChannel as a subclass of MucChannel, you'll
have this crash when trying to use the group mixin:

** CRITICAL **: tp_mixin_offset_cast: assertion `offset != 0' failed

#4  0xb7cdcf89 in g_log () from /usr/lib/libglib-2.0.so.0
#5  0xb7cdd06b in g_return_if_fail_warning () from /usr/lib/libglib-2.0.so.0
#6  0xb7c90152 in tp_mixin_offset_cast (instance=0x80cb9d0, offset=0) at
util.c:158
#7  0xb7c8647d in tp_group_mixin_add_members (obj=0x80ce808,
contacts=0x80abc80, message=0x809eb39 "", error=0x0) at group-mixin.c:451
#8  0x08064632 in salut_muc_channel_invited (self=0x80ce808, inviter=1,
stanza=0x0, error=0x0) at salut-muc-channel.c:854


As an ugly workaround, you can recall tp_group_mixin_class_init,
tp_group_mixin_init (using the MucChannel offset) and
tp_group_mixin_change_flags in FooMucChannel's code.


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