RE: [PATCH] Showing the relevant part of a diff

[Herring, Davis]

> "soon" has finally arrived.  There are now several "preparatory"
> patches.  The first is just an update of the cleanup from before
> (February), but then there's [...]

My subtlety will be by undoing.  For those who haven't been waiting 5 months 
with bated breath, this is what "February" means: 
http://lists.gnu.org/archive/html/emacs-devel/2016-02/msg01066.html and 
following.

In short, in several circumstances where the text of a buffer is the "new" side 
of a diff (C-x v =, C-x v D, M-x diff-backup, and M-x diff-buffer-with-file; we 
could add M-x diff itself), this code displays the diff with point set to the 
place in the diff that corresponds to point in the buffer.  This is either a 
context line, an added/changed line, or the boundary between two hunks (or 
before the first, or after the last) in case point is too far from a change to 
be included in the context.

C-x v = was the original inspiration: this changes it from "What have I changed 
in this file?" to "What have I changed _here_?".  I frequently find myself 
wanting to ask the latter question, and searching through the diff for my 
current position is tedious.  If the answer is "nothing, but there are changes 
elsewhere in the file", putting point on a hunk boundary shows what the nearest 
changes are.

Davis

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