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setLastReadEvent() is called in any case (read marks a stored in a hashmap so it's a constant time operation anyway); postReceipt() is now called for the nearest previous non-local message.
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receipts for own messages to the server
As discussed with Matthew in #quaternion: https://matrix.to/#/!PCzUtxtOjUySxSelof:matrix.org/$14768896199130qcJqe:matrix.org
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This replaces the one-by-one timestamp-ordering algorithm of adding new
messages with copying the whole group of just-arrived messages to either
the beginning or the end of the timeline.
Since origin timestamps do not provide a reasonable order,
findInsertionPos() is entirely deleted. processMessageEvent() is
replaced by two functions: addNewMessageEvents() appends at
messageEvents.end() while addHistoricalMessageEvents() inserts them at
messageEvents.begin(). There's no official way to insert messages in the
middle; cases when getPreviousContent() is called in parallel or a
RoomMessagesJob runs on a gap somewhere in the middle of the timeline
weren't considered before this commit and aren't considered in it.
The new ordering requires you to understand where you have got your
events from (or rather, where you want to insert them). In particular,
updateData() that processes /sync results uses addNewMessageEvents();
getPreviousContent() calls addHistoricalMessageEvents().
In order to notify clients, a single newMessages() signal gives way to
3 new signals: 2 aboutToAdd*Messages() and a common addedMessages().
In addition, clients can derive from Room and use doAdd*Messages()
virtual functions to alter/extend the behaviour.
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To facilitate a possible change of a container type.
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signal, which clients should use in the room context.
Processing changes of user displaynames is tricky: we have to not only deal with the currently renamed user but also with its past and new namesakes which might change representation due to that renaming. So in the worst case a single User::nameChanged signal may lead to three Room::memberRenamed references (and 3 user displaynames updated in the UI, respectively). And the newly added users should be taken care of in a similar manner, of course.
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a displayname update.
This changes the way displayname is supplied to a client application - instead of calculating immediately, displayname becomes a separate stored value that is refreshed with every change of the list of members, or the name, or the canonical alias. displaynameChanged signal is supplied to subscribe to these updates: in case of displaying a room in the roomlist a client should use this new signal instead of Room::namesChanged.
The displaname calculation algorithm is described in section 11.2.2.5 of the CS spec: https://matrix.org/docs/spec/r0.0.1/client_server.html#calculating-the-display-name-for-a-room
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According to section 11.2.2.3 of the CS spec, clients SHOULD follow a certain algorithm of making a non-ambiguous display name of a user in the room context. This algorithm implies checking whether other room members have the same display name. This commit prepares for implementation of the algorithm:
1. Use a hash map instead of a list to store room members. The external Room::users() API is kept intact.
2. Convenience CRUD methods are implemented to deal with the hash map.
3. An additional slot for user renaming is introduced (because renaming affects the hash map). Binding of actual signals is left for the next commit.
4. nullptr is the recommended representation of a null pointer since C++11. Use that and mandate compiler support of that.
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In particular, this will be needed to render room names according to the CS spec.
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Originally by Felx Rohrbach (kde@fxrh.de)
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