fixing bugs with the textarea and background task

util/AsyncTask.py

@@ -0,0 +1,40 @@
+import threading
+
+
+class AsyncTask(threading.Thread):
+    """
+        AsyncTask
+
+    AsyncTask is a utility class allowing to execute a task asynchronously in a thread.
+    For more informations read the constructor documentation.
+
+    @author     Jérémi Nihart / EndMove
+    @link       https://git.endmove.eu/EndMove/WebPicDownloader
+    @version    1.0.0
+    @since      2022-09-01
+    """
+    # Variables
+    __callback = None
+    __args: list = None
+
+    # Constructor
+    def __init__(self, callback, args=()) -> None:
+        """
+            Constructor
+        => Spacify here the function that should be launched asynchronously. Then use the
+        function {AsyncTask.start()} to start the thread and the processing.
+        [!]: The function {AsyncTask.run()} is reserved for the thread and should not be run
+        from outside.
+
+        :callback: -> Is the function to launch asynchronously.
+        :args: -> Argument to pass to the function when executing it.
+        """
+        super().__init__()
+        self.__callback = callback
+        self.__args = args
+
+    def run(self) -> None:
+        """
+        [!] : This function should not be used! Start the task with {AsyncTask.start()}!
+        """
+        self.__callback(*self.__args)