VC: New commands for incoming and outgoing fileset diffs

* lisp/vc/vc.el (vc-fileset-diff-incoming)
(vc-fileset-diff-outgoing): New commands.
(vc-root-diff-incoming): Refactor to call
vc-fileset-diff-incoming.
(vc-root-diff-outgoing): Refactor to call
vc-fileset-diff-outgoing.
* lisp/vc/vc-hooks.el (vc-incoming-prefix-map)
(vc-outgoing-prefix-map): Bind the new commands.
* doc/emacs/maintaining.texi (VC Change Log):
* etc/NEWS: Document the new commands.

1 files changed, 8 insertions, 4 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 4a193484591..ebf03b53e12 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2131,15 +2131,19 @@ relevant buffers before generating the contents of a VC Directory buffer
 (like the third-party package Magit does with its status buffer).
 
 +++
-*** New commands 'vc-root-diff-incoming' and 'vc-root-diff-outgoing'.
-These commands report diffs of all the changes that would be pulled and
-would be pushed, respectively.  They are the diff analogues of the
-existing commands 'vc-log-incoming' and 'vc-log-outgoing'.
+*** New commands to report incoming and outgoing diffs.
+'vc-root-diff-incoming' and 'vc-root-diff-outgoing' report diffs of all
+the changes that would be pulled and would be pushed, respectively.
+They are the diff analogues of the existing commands 'vc-log-incoming'
+and 'vc-log-outgoing'.
 
 In particular, 'vc-root-diff-outgoing' is useful as a way to preview
 your push and ensure that all and only the changes you intended to
 include were committed and will be pushed.
 
+'vc-fileset-diff-incoming' and 'vc-fileset-diff-outgoing' are similar
+but limited to the current VC fileset.
+
 +++
 *** New user option 'vc-use-incoming-outgoing-prefixes'.
 If this is customized to non-nil, 'C-x v I' and 'C-x v O' become prefix