Thread fetch more button

Changes threads so there is a button to fetch more events. Also adds a separator between the thread root and the rest of the events.

src/timeline/BaseMessageComponentChooser.qml

@@ -2,8 +2,11 @@
 // SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 import QtQuick
+import QtQuick.Layouts
 import Qt.labs.qmlmodels
 
+import org.kde.kirigami as Kirigami
+
 import org.kde.neochat
 
 /**
@@ -54,6 +57,11 @@ DelegateChooser {
 
     signal removeLinkPreview(int index)
 
+    /**
+     * @brief Request more events in the thread be loaded.
+     */
+    signal fetchMoreEvents()
+
     role: "componentType"
 
     DelegateChoice {
@@ -218,6 +226,14 @@ DelegateChooser {
         }
     }
 
+    DelegateChoice {
+        roleValue: MessageComponentType.FetchButton
+        delegate: FetchButtonComponent {
+            maxContentWidth: root.maxContentWidth
+            onFetchMoreEvents: root.fetchMoreEvents()
+        }
+    }
+
     DelegateChoice {
         roleValue: MessageComponentType.Verification
         delegate: MimeComponent {
@@ -233,6 +249,14 @@ DelegateChooser {
         }
     }
 
+    DelegateChoice {
+        roleValue: MessageComponentType.Separator
+        delegate: Kirigami.Separator {
+            Layout.fillWidth: true
+            Layout.maximumWidth: root.maxContentWidth
+        }
+    }
+
     DelegateChoice {
         roleValue: MessageComponentType.Other
         delegate: Item {}