Rework vc stash bindings

This adds create/snapshot bindings to the stash button even when there
are no stashes, and extends the stash menu bindings.

* etc/NEWS: Announce the bindings.

* lisp/vc/vc-git.el (vc-git-stash-shared-map): New keymap.  Holds
shared bindings between stash button and stash list.
(vc-git-stash-map): Inherit from vc-git-stash-shared-map.
(vc-git-stash-button-map): New keymap.  Holds button bindings,
inherit from vc-git-stash-shared-map.
(vc-git-stash-shared-help, vc-git-stash-list-help): New
defconsts.  Abstract out list/button help texts.
(vc-git--make-button-text): Set keymap property to
vc-git-stash-button-map.
(vc-git-make-stash-button): Use vc-git-stash-shared-help.
(vc-git-stash-menu-map): Add items for vc-git-stash and
vc-git-stash-snapshot.
(vc-git-dir-extra-headers): Use vc-git-stash-list-help and
vc-git-stash-shared-help.  Add vc-git-stash and
vc-git-stash-snapshot bindings to text shown when there are no stashes.

1 files changed, 4 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index cd1e46bb872..ee73d2414bd 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -879,6 +879,10 @@ When no files are marked, all modified files are stashed, as before.
 *** 'vc-git-stash' has now been bound to the 'C' keystroke in the
 stash headers.
 
+*** Some stash keybindings are now available in the stash button.
+'vc-git-stash' and 'vc-git-stash-snapshot' can now be run using 'C'
+and 'S' respectively, including when there are no stashes.
+
 *** The new hook 'vc-retrieve-tag-hook' runs after retrieving a tag.
 
 ---