Allow `process-contact' not to block

* doc/lispref/processes.texi (Process Information): Document it.

* lisp/simple.el (list-processes--refresh): Don't wait for contact
information for non-setup processes.

* src/process.c (Fprocess_contact): Take an optional parameter to
avoid blocking (bug#37408).

1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index 358b6a4f200..a267200aeb9 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -4107,7 +4107,7 @@ Also, delete any process that is exited or signaled."
                     (t "--")))
                   (cmd
                    (if (memq type '(network serial))
-                       (let ((contact (process-contact p t)))
+                       (let ((contact (process-contact p t t)))
                          (if (eq type 'network)
                              (format "(%s %s)"
                                      (if (plist-get contact :type)