GetRoomEventsJob (replaces RoomMessagesJob) + refactoring

1. Updates in this commit (see further) allow to generate and build
GetRoomEventsJob from message_pagination.yaml; this job completely
preempts RoomMessagesJob.
2. EventsBatch<> is no more a thing; there's EventsArray<> to replace it
but it's loaded from a JSON array rather than an event batch (a JSON
array inside another JSON object). SyncJob that used it extensively has
been moved to "conventional" containers (Events, RoomEvents and the
newly introduced StateEvents). RoomMessagesJob that also used
EventsBatch<> is decommissioned (see above).
3. RoomEventsRange is now an alias for Range<RoomEvents>, defined in
util.h (otherwise almost the same).
4. Connection::getMessages() is no more. Use Room::getPreviousContent()
and Connection::callApi<GetRooMEventsJob>() instead.
5. Moving things around in Room, since SyncJob now supplies state events
in more specific StateEvents, rather than RoomEvents.

1 files changed, 16 insertions, 7 deletions

diff --git a/lib/events/event.cpp b/lib/events/event.cpp
index 193250de..57049671 100644
--- a/lib/events/event.cpp
+++ b/lib/events/event.cpp
@@ -160,14 +160,13 @@ void RoomEvent::addId(const QString& id)
 template <>
 RoomEventPtr _impl::doMakeEvent(const QJsonObject& obj)
 {
-    return RoomEventPtr { makeIfMatches<RoomEvent,
-        RoomMessageEvent, RoomNameEvent, RoomAliasesEvent,
-        RoomCanonicalAliasEvent, RoomMemberEvent, RoomTopicEvent,
-        RoomAvatarEvent, EncryptionEvent, RedactionEvent>
-            (obj, obj["type"].toString()) };
-}
+    // Check more specific event types first
+    if (auto e = doMakeEvent<StateEventBase>(obj))
+        return e;
 
-StateEventBase::~StateEventBase() = default;
+    return makeIfMatches<RoomEvent,
+        RoomMessageEvent, RedactionEvent>(obj, obj["type"].toString());
+}
 
 bool StateEventBase::repeatsState() const
 {
@@ -176,3 +175,13 @@ bool StateEventBase::repeatsState() const
                                 .toObject().value("prev_content");
     return contentJson == prevContentJson;
 }
+
+template<>
+StateEventPtr _impl::doMakeEvent<StateEventBase>(const QJsonObject& obj)
+{
+    return makeIfMatches<StateEventBase,
+        RoomNameEvent, RoomAliasesEvent,
+        RoomCanonicalAliasEvent, RoomMemberEvent, RoomTopicEvent,
+        RoomAvatarEvent, EncryptionEvent>(obj, obj["type"].toString());
+
+}