An internal container class, this is exposed for Msgthr#thread! Msgthr#order! and Msgthr#walk_thread APIs through block parameters. They should should not be initialized in your own code.
One container object will exist for every message you call Msgthr#add! on, so there can potentially be many of these objects for large sets of messages.
You probably do not need to use this. It is only safe to access this after
Msgthr#order! This contains
an Array of Msgthr::Container objects which
have the parent field pointing to us
Unique message identifier, typically the Message-Id header for mail and news messages. This may be any hashable object, Integer values are allowed and will not be coerced to string values.
Opaque data pointer, may be used by the user for any purpose. This is
nil to denote missing (aka "ghost") messages.
topmost () source
Returns the topmost message container with an opaque message pointer in it.
This may be nil if no message is available. This is preferable
to using the container yielded by Msgthr#order! directly when
handling incomplete message sets.
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