emacs: notmuch-tree: mark the initial message at point as read

When moving between message in a tree or show buffer, the message at
point is marked as read.  Likewise when creating such a buffer, then
the message that is initially at point is supposed to be marked as
read as well.

The latter worked for `notmuch-show' but not for `notmuch-tree'.
Press "RET" or "M-RET" in a search buffer to observe these behaviors.

In both cases the marking is supposed to be done by the function
`notmuch-show-command-hook'.  In the case of `notmuch-show' that
function is added directly to `post-command-hook'.

`notmuch-tree' instead adds the function `notmuch-tree-command-hook'
to `post-command-hook' and that calls `notmuch-show-command-hook',
in the respective show buffer, but of course only if that exists.

Because the tree buffer is created asynchronously, the show buffer
doesn't exist yet by the time the `post-command-hook' is run, so
we have to explicitly run `notmuch-tree-command-hook' once the
show buffer exists.

The show buffer is created when `notmuch-tree-goto-and-insert-msg'
calls `notmuch-tree-show-message-in'.  `notmuch-tree-process-filter'
is what finally brings us here.

1 files changed, 2 insertions, 1 deletions

diff --git a/emacs/notmuch-tree.el b/emacs/notmuch-tree.el
index eb7ea941..ef1ca4c5 100644
--- a/emacs/notmuch-tree.el
+++ b/emacs/notmuch-tree.el
@@ -954,7 +954,8 @@ unchanged ADDRESS if parsing fails."
       (goto-char (point-max))
       (forward-line -1)
       (when notmuch-tree-open-target
-	(notmuch-tree-show-message-in)))))
+	(notmuch-tree-show-message-in)
+	(notmuch-tree-command-hook)))))
 
 (defun notmuch-tree-insert-tree (tree depth tree-status first last)
   "Insert the message tree TREE at depth DEPTH in the current thread.