Simplify the inserting and processing of messages.

Message widgets are now inserted into the listView through the `rowsInserted` callback of the messages model.

Messages are processed in the GetMessagesTask and GetApplicationMessagesTask when fetching multiple new messages. Single new incoming messages are processed in ProcessMessageTask.

gotify_tray/gui/models/MessagesModel.py

@@ -3,6 +3,10 @@ import enum
 from typing import cast
 from PyQt6 import QtCore, QtGui
 from gotify_tray import gotify
+from gotify_tray.database import Settings
+
+
+settings = Settings("gotify-tray")
 
 
 class MessageItemDataRole(enum.IntEnum):
@@ -16,6 +20,20 @@ class MessagesModelItem(QtGui.QStandardItem):
 
 
 class MessagesModel(QtGui.QStandardItemModel):
+    def update_last_id(self, i: int):
+        if i > settings.value("message/last", type=int):
+            settings.setValue("message/last", i)
+
+    def insert_message(self, row: int, message: gotify.GotifyMessageModel):
+        self.update_last_id(message.id)
+        message_item = MessagesModelItem(message)
+        self.insertRow(row, message_item)
+    
+    def append_message(self, message: gotify.GotifyMessageModel):
+        self.update_last_id(message.id)
+        message_item = MessagesModelItem(message)
+        self.appendRow(message_item)
+
     def setItem(self, row: int, column: int, item: MessagesModelItem) -> None:
         super(MessagesModel, self).setItem(row, column, item)