emacs: Bind <backtab> (shift-TAB) to notmuch-show-previous-button

Shift-TAB is standard "opposite" of TAB -- in GUI interfaces they
typically cycle through input elements in opposite orders -- so it
makes sense to behave the same way.

Signed-off-by: Nelson Elhage <nelhage@ksplice.com>

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 4b1baf38dd2a5bcc3fc64145fb15407943be7bd1..b0815a02d05da0abbfe5af9c265e4733aaaa4df8 100644 (file)
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -548,6 +548,7 @@ function is used. "
        (define-key map "?" 'notmuch-help)
        (define-key map "q" 'kill-this-buffer)
        (define-key map (kbd "M-TAB") 'notmuch-show-previous-button)
+       (define-key map (kbd "<backtab>") 'notmuch-show-previous-button)
        (define-key map (kbd "TAB") 'notmuch-show-next-button)
        (define-key map "s" 'notmuch-search)
        (define-key map "m" 'notmuch-mua-mail)