Allow the condition for when messages are automatically marked as read to be configurable.

Title this adds a number of options for when messages should be automatically marked as read for the user to choose from.

![image](/uploads/cef95f8c6c77bfdcabb7a8a309bc1fd2/image.png){width=480 height=262}

src/libneochat/CMakeLists.txt

@@ -28,6 +28,7 @@ target_sources(LibNeoChat PRIVATE
     enums/pushrule.h
     enums/roomsortparameter.cpp
     enums/roomsortorder.h
+    enums/timelinemarkreadcondition.h
     events/imagepackevent.cpp
     events/pollevent.cpp
     jobs/neochatgetcommonroomsjob.cpp

src/libneochat/enums/timelinemarkreadcondition.h

@@ -0,0 +1,32 @@
+// SPDX-FileCopyrightText: 2025 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#pragma once
+
+#include <QObject>
+#include <QQmlEngine>
+
+/**
+ * @class TimelineMarkReadCondition
+ *
+ * This class is designed to define the TimelineMarkReadCondition enumeration.
+ */
+class TimelineMarkReadCondition : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+    QML_UNCREATABLE("")
+
+public:
+    /**
+     * @brief The condition for marking messages as read.
+     */
+    enum Condition {
+        Never = 0, /**< Messages should never be marked automatically. */
+        Entry, /**< Messages should be marked automatically on entry to the room. */
+        EntryVisible, /**< Messages should be marked automatically on entry to the room if all messages are visible. */
+        Exit, /**< Messages should be marked automatically on exiting the room. */
+        ExitVisible, /**< Messages should be marked automatically on exiting the room if all messages are visible. */
+    };
+    Q_ENUM(Condition);
+};