Connect Qt preparation notifications to the conversation view

tools/chatgui/src/mainwindow.cpp

@@ -490,6 +490,9 @@ void MainWindow::setupBridgeCallbacks() {
         if (s_mainWindow)
             s_mainWindow->m_messageList->onDmMessages(data, len);
     });
+    gui_bridge_set_attachment_preparation_cb([](const uint8_t* data, int len) {
+        if (s_mainWindow) s_mainWindow->m_messageList->onAttachmentPreparation(data, len);
+    });
 }
 
 void MainWindow::setupConnects() {