bug#46459: 28.0.50; Shared keymap for Git VC dir "Branch" header?

[Robert Pluim]

>>>>> On Fri, 12 Feb 2021 08:54:13 +0200, Protesilaos Stavrou 
>>>>> <info@protesilaos.com> said:

    Protesilaos> Dear maintainers,
    Protesilaos> In vc-git.el the header for vc-dir stashes is propertized with 
its own
    Protesilaos> keymap.  This means that while point is over the value of the 
"Stash:"
    Protesilaos> header, the specified keymap comes into effect, instead of the 
main one
    Protesilaos> for vc-dir.  The latter takes effect when point is anywhere 
but that
    Protesilaos> header's value.

    Protesilaos> Should this principle be applied to the value of the "Branch" 
header as
    Protesilaos> well?  The attached patch is a proof-of-concept to that end.

    Protesilaos> If you believe this is worth doing, what else do you think 
should go
    Protesilaos> into such a patch from a usability standpoint?

Looks good to me, although Iʼve just noticed the vc and vc-dir have
confusingly different bindings for vc-retrieve-tag and vc-create-tag
Maybe put vc-create-tag on C-x v c as well?

Robert