aboutdialog: Port to Gtk4
The response signal does not exist anymore. It has been replaced by "close-request". Also, it is now useless to listen to "close-request" because the dialog is automatically destroyed on close.
Close: #502 (closed)
The response signal does not exist anymore. It has been replaced by "close-request". Also, it is now useless to listen to "close-request" because the dialog is automatically destroyed on close.
Close: #502 (closed)