call setText when sending a reply

securedrop_client/gui/widgets.py

@@ -2345,7 +2345,7 @@ def send_reply(self) -> None:
             reply_uuid = str(uuid4())
             self.controller.send_reply(self.source.uuid, reply_uuid, reply_text)
             self.reply_sent.emit(self.source.uuid, reply_uuid, reply_text)
-            self.text_edit.clear()
+            self.text_edit.setText('')
 
     def _on_authentication_changed(self, authenticated: bool) -> None:
         if authenticated:

tests/gui/test_widgets.py

@@ -2215,15 +2215,33 @@ def test_ReplyBoxWidget_send_reply(mocker):
     scw.conversation_view.on_reply_sent = on_reply_sent_fn
     scw.reply_box.reply_sent = mocker.MagicMock()
     scw.reply_box.text_edit = ReplyTextEdit(source, controller)
+    scw.reply_box.text_edit.setText = mocker.MagicMock()
     scw.reply_box.text_edit.setPlainText('Alles für Alle')
 
     scw.reply_box.send_reply()
 
     scw.reply_box.reply_sent.emit.assert_called_once_with('abc123', '456xyz', 'Alles für Alle')
-    assert scw.reply_box.text_edit.toPlainText() == ''
+    scw.reply_box.text_edit.setText.assert_called_once_with('')
     controller.send_reply.assert_called_once_with('abc123', '456xyz', 'Alles für Alle')
 
 
+def test_ReplyBoxWidget_send_reply_calls_setText_after_send(mocker):
+    """
+    Ensure sending a reply from the reply box emits signal, clears text box, and sends the reply
+    details to the controller.
+    """
+    source = factory.Source()
+    controller = mocker.MagicMock()
+    rb = ReplyBoxWidget(source, controller)
+    rb.text_edit = ReplyTextEdit(source, controller)
+    setText = mocker.patch.object(rb.text_edit, 'setText')
+    rb.text_edit.setPlainText('Alles für Alle')
+
+    rb.send_reply()
+
+    setText.assert_called_once_with('')
+
+
 def test_ReplyBoxWidget_send_reply_does_not_send_empty_string(mocker):
     """
     Ensure sending a reply from the reply box does not send empty string.