Better read market handling: Mark room as read when scrolling to the

bottom

Fix #372

imports/NeoChat/Page/RoomPage.qml

@@ -23,13 +23,18 @@ Kirigami.ScrollablePage {
 
     /// It's not readonly because of the seperate window view.
     property var currentRoom: RoomManager.currentRoom
+    /// Used to determine if scrolling to the bottom should mark the message as unread
+    property bool hasScrolledUpBefore: false;
 
     title: currentRoom.displayName
 
     signal switchRoomUp()
     signal switchRoomDown()
 
-    onCurrentRoomChanged: ChatBoxHelper.clearEditReply()
+    onCurrentRoomChanged: {
+        hasScrolledUpBefore = false;
+        ChatBoxHelper.clearEditReply()
+    }
 
     ActionsHandler {
         id: actionsHandler
@@ -254,6 +259,13 @@ Kirigami.ScrollablePage {
             messageEventModel.fetchMore(messageEventModel.index(0, 0));
         }
 
+        onAtYEndChanged: if (atYEnd && hasScrolledUpBefore) {
+            currentRoom.markAllMessagesAsRead();
+            hasScrolledUpBefore = false;
+        } else if (!atYEnd) {
+            hasScrolledUpBefore = true;
+        }
+
         QQC2.Popup {
             anchors.centerIn: parent