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Room History Visibility
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=======================
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Whether a member of a room can see the events that happened in a room from
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before they joined the room is controlled by the ``history_visibility`` key
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of the ``m.room.history_visibility`` state event. The valid values for
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``history_visibility`` are:
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- ``shared``
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- ``invited``
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- ``joined``
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By default if no ``history_visibility`` is set it is assumed to be ``shared``.
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The rules governing whether a user is allowed to see an event depend solely on
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the state of the room at that event:
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1. If the user was joined, allow.
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2. If the user was invited and the ``history_visibility`` was set to
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``invited`` or ``shared``, allow.
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3. If the user was neither invited nor joined but the ``history_visibility``
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was set to ``shared``, allow.
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4. Otherwise, deny.
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