This signal is emitted when a #WebKitUserMessage is received from the
#WebKitWebPage corresponding to @web_view. You can reply to the message
using webkit_user_message_send_reply().
You can handle the user message asynchronously by calling g_object_ref() on
@message and returning %TRUE. If the last reference of @message is removed
and the message has not been replied to, the operation in the #WebKitWebPage will
finish with error %WEBKIT_USER_MESSAGE_UNHANDLED_MESSAGE.
This signal is emitted when a #WebKitUserMessage is received from the #WebKitWebPage corresponding to @web_view. You can reply to the message using webkit_user_message_send_reply().
You can handle the user message asynchronously by calling g_object_ref() on @message and returning %TRUE. If the last reference of @message is removed and the message has not been replied to, the operation in the #WebKitWebPage will finish with error %WEBKIT_USER_MESSAGE_UNHANDLED_MESSAGE.