Add default value to notmuch-search-line-faces to show "unread"
messages in bold, and "flagged" messages in red, to have some visual
indication of important messages in search results. This should be
helpful for new users.

"unread" tag is quite obvious, and handled specially both in the lib
and emacs ui. "flagged" is synced to maildir F flag in the lib. If one
syncs the maildir to IMAP, this also translates to corresponding IMAP
flag. (This is "starred" in GMail and Android.)

Signed-off-by: Jani Nikula <jani@nikula.org>
---
 emacs/notmuch.el |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index 6b2c252..551ea9d 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -662,7 +662,8 @@ This function advances the next thread when finished."
 		  (goto-char (point-min))
 		  (forward-line (1- notmuch-search-target-line))))))))
 
-(defcustom notmuch-search-line-faces nil
+(defcustom notmuch-search-line-faces '(("unread" :weight bold)
+				       ("flagged" :foreground "red"))
   "Tag/face mapping for line highlighting in notmuch-search.
 
 Here is an example of how to color search results based on tags.
-- 
1.7.5.4