Allow 'package-isolate' to fetch missing packages

* lisp/emacs-lisp/package.el (package-isolate): Fetch missing
packages and make them available in the new Emacs process, but
not the current one.
* etc/NEWS: Mention change.

1 files changed, 5 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 6df77525bf6..98059ef15f6 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2804,6 +2804,11 @@ When called from Lisp, it now only accepts a symbol.
 When invoking the command in a Dired buffer with marked files,
 the command will only copy those files.
 
+---
+*** 'package-isolate' can now also install packages.
+If a package is missing, 'package-isolate' will fetch the missing
+tarballs and prepare them to be activated in the sub-process.
+
 +++
 *** package-x.el is now obsolete.