[PATCH v2] emacs: display tags in notmuch-show with links

[Damien Cassou]

This patch obsoletes
id:1352565719-12397-1-git-send-email-damien.cassou at gmail.com

[PATCH 1/4] emacs: Add a thread's tags to emacs header-line
[PATCH 2/4] emacs: Make tags in header-line clickable
[PATCH 3/4] emacs: Make tags that appear in `notmuch-show' clickable
[PATCH 4/4] emacs: Add unit-tests for clickable tags in notmuch-show

This patch makes clickable all tags that appear in notmuch-show
buffers. Each tag is a link to open a new notmuch-search buffer for
this tag. Additionally, the buffer's header-line now shows the
thread's tags (clickable only if the `header-button' library is loaded
or loadable).

This patch is the first one of an upcoming series whose goal is to
integrate notmuch-labeler into notmuch. See the following for more
details:
https://github.com/DamienCassou/notmuch-labeler

With respect to v2, I took care of the comments you made:
- The header-button library is not attached to the patch anymore. The
  tags in the header-line are always displayed but made clickable only
  if the library is loaded or loadable.
- The large patch is separated into a series of 4 smaller patches.

You can follow this patch series on
https://github.com/DamienCassou/notmuch/tree/labeler-integration-slow