Fix getting content models for old events in a search model

Fix getting content models for old events in a search model by allowing for calling using the event. This gets past the intial checks and the content model itself can load the event from the server.

Requires network/neochat!2110 to fix the showauthor issue

src/models/messagemodel.cpp

@@ -120,11 +120,7 @@ QVariant MessageModel::data(const QModelIndex &idx, int role) const
     }
 
     if (role == ContentModelRole) {
-        auto evtOrTxnId = event->get().id();
-        if (evtOrTxnId.isEmpty()) {
-            evtOrTxnId = event->get().transactionId();
-        }
-        return QVariant::fromValue<MessageContentModel *>(m_room->contentModelForEvent(evtOrTxnId));
+        return QVariant::fromValue<MessageContentModel *>(m_room->contentModelForEvent(&event->get()));
     }
 
     if (role == GenericDisplayRole) {

src/neochatroom.cpp

@@ -1740,28 +1740,42 @@ NeochatRoomMember *NeoChatRoom::qmlSafeMember(const QString &memberId)
     return m_memberObjects[memberId].get();
 }
 
-MessageContentModel *NeoChatRoom::contentModelForEvent(const QString &evtOrTxnId)
+MessageContentModel *NeoChatRoom::contentModelForEvent(const QString &eventId)
 {
-    const auto event = getEvent(evtOrTxnId);
-    if (event.first == nullptr) {
+    if (eventId.isEmpty()) {
+        return nullptr;
+    }
+
+    if (!m_eventContentModels.contains(eventId)) {
+        return m_eventContentModels.emplace(eventId, std::make_unique<MessageContentModel>(this, eventId)).first->second.get();
+    }
+
+    return m_eventContentModels[eventId].get();
+}
+
+MessageContentModel *NeoChatRoom::contentModelForEvent(const Quotient::RoomEvent *event)
+{
+    const auto roomMessageEvent = eventCast<const Quotient::RoomMessageEvent>(event);
+    if (roomMessageEvent == nullptr) {
         // If for some reason a model is there remove.
-        if (m_eventContentModels.contains(evtOrTxnId)) {
-            m_eventContentModels.erase(evtOrTxnId);
+        if (m_eventContentModels.contains(event->id())) {
+            m_eventContentModels.erase(event->id());
+        }
+        if (m_eventContentModels.contains(event->transactionId())) {
+            m_eventContentModels.erase(event->transactionId());
         }
         return nullptr;
     }
 
-    if (event.first->isStateEvent() || event.first->matrixType() == u"org.matrix.msc3672.beacon_info"_s) {
+    if (event->isStateEvent() || event->matrixType() == u"org.matrix.msc3672.beacon_info"_s) {
         return nullptr;
     }
 
-    auto eventId = event.first->id();
-    const auto txnId = event.first->transactionId();
+    auto eventId = event->id();
+    const auto txnId = event->transactionId();
     if (!m_eventContentModels.contains(eventId) && !m_eventContentModels.contains(txnId)) {
-        if (eventId.isEmpty()) {
-            eventId = txnId;
-        }
-        return m_eventContentModels.emplace(eventId, std::make_unique<MessageContentModel>(this, eventId, false, event.second)).first->second.get();
+        return m_eventContentModels.emplace(eventId, std::make_unique<MessageContentModel>(this, eventId.isEmpty() ? txnId : eventId, false, eventId.isEmpty()))
+            .first->second.get();
     }
 
     if (!eventId.isEmpty() && m_eventContentModels.contains(eventId)) {

src/neochatroom.h

@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <Quotient/events/roomevent.h>
 #include <Quotient/room.h>
 
 #include <QCache>
@@ -589,8 +590,35 @@ public:
 
     NeochatRoomMember *qmlSafeMember(const QString &memberId);
 
+    /**
+     * @brief Returns the content model for the given event ID.
+     *
+     * A model is created is one doesn't exist. Will return nullptr if evtOrTxnId
+     * is empty.
+     *
+     * @warning If a non-empty ID is given it is assumed to be a valid Quotient::RoomMessageEvent
+     *          event ID. The caller must ensure that the ID is a real event. A model will be
+     *          returned unconditionally.
+     *
+     * @warning Do NOT use for pending events as this function has no way to differentiate.
+     */
     MessageContentModel *contentModelForEvent(const QString &evtOrTxnId);
 
+    /**
+     * @brief Returns the content model for the given event.
+     *
+     * A model is created is one doesn't exist. Will return nullptr if event is:
+     *  - nullptr
+     *  - not a Quotient::RoomMessageEvent (e.g a state event)
+     *
+     * @note This method is preferred to the version using just an event ID as it
+     *       can perform some basic checks. If a copy of the event is not available,
+     *       you may have to use the version that takes an event ID.
+     *
+     * @note This version must be used for pending events as it can differentiate.
+     */
+    MessageContentModel *contentModelForEvent(const Quotient::RoomEvent *event);
+
     /**
      * @brief Returns the thread model for the given thread root event ID.
      *