Add dialog to see who has read this message

You were previously relegated to looking at any avatars or a buggy
tooltip, but suffer no longer! If you tap on a message's read marker, a
dialog will pop up listing the users who have read it.

Uou can also view their profiles from here, etc.

src/timeline/models/readmarkermodel.cpp

@@ -7,8 +7,6 @@
 
 #include <Quotient/roommember.h>
 
-#define MAXMARKERS 5
-
 using namespace Qt::StringLiterals;
 
 ReadMarkerModel::ReadMarkerModel(const QString &eventId, NeoChatRoom *room)
@@ -85,13 +83,17 @@ QVariant ReadMarkerModel::data(const QModelIndex &index, int role) const
         return member.color();
     }
 
+    if (role == UserIdRole) {
+        return member.id();
+    }
+
     return {};
 }
 
 int ReadMarkerModel::rowCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent)
-    return std::min(int(m_markerIds.size()), MAXMARKERS);
+    return m_markerIds.size();
 }
 
 QHash<int, QByteArray> ReadMarkerModel::roleNames() const
@@ -100,6 +102,7 @@ QHash<int, QByteArray> ReadMarkerModel::roleNames() const
         {DisplayNameRole, "displayName"},
         {AvatarUrlRole, "avatarUrl"},
         {ColorRole, "memberColor"},
+        {UserIdRole, "userId"},
     };
 }
 
@@ -122,17 +125,4 @@ QString ReadMarkerModel::readMarkersString()
     return readMarkersString;
 }
 
-QString ReadMarkerModel::excessReadMarkersString()
-{
-    if (m_room == nullptr) {
-        return {};
-    }
-
-    if (m_markerIds.size() > MAXMARKERS) {
-        return u"+ "_s + QString::number(m_markerIds.size() - MAXMARKERS);
-    } else {
-        return QString();
-    }
-}
-
 #include "moc_readmarkermodel.cpp"

src/timeline/models/readmarkermodel.h

@@ -26,13 +26,6 @@ class ReadMarkerModel : public QAbstractListModel
      */
     Q_PROPERTY(QString readMarkersString READ readMarkersString NOTIFY reactionUpdated)
 
-    /**
-     * @brief Returns the number of excess user read markers for the event.
-     *
-     * This returns a string in the form "+ x" ready for use in the UI.
-     */
-    Q_PROPERTY(QString excessReadMarkersString READ excessReadMarkersString NOTIFY reactionUpdated)
-
 public:
     /**
      * @brief Defines the model roles.
@@ -41,12 +34,12 @@ public:
         DisplayNameRole = Qt::DisplayRole, /**< The display name of the member in the room. */
         AvatarUrlRole, /**< The avatar for the member in the room. */
         ColorRole, /**< The color for the member. */
+        UserIdRole, /** The user ID for the member. */
     };
 
     explicit ReadMarkerModel(const QString &eventId, NeoChatRoom *room);
 
     QString readMarkersString();
-    QString excessReadMarkersString();
 
     /**
      * @brief Get the given role value at the given index.