GitLab

* lib-src/emacsclient.c (longopts, decode_options, print_help_and_exit):
New arg `-parent-id'.
(main): Send parent-id to Emacs.

* lisp/server.el (server-process-filter): Receive parent-id argument
from emacsclient.
(server-create-window-system-frame): New arg.  Pass parent-id as
frame parameter.