notmuch-tree did not protect against concurrent refreshes like
notmuch-search, meaning, hitting '=' (notmuch-refresh-this-buffer)
quickly will spawn multiple parallel notmuch processes, and clobber
the existing results in the current buffer.

* notmuch-tree.el: Add a guard to notmuch-tree-refresh-view similar to
  the one in notmuch-search.
---
 emacs/notmuch-tree.el | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/emacs/notmuch-tree.el b/emacs/notmuch-tree.el
index 022525ae..c64a097a 100644
--- a/emacs/notmuch-tree.el
+++ b/emacs/notmuch-tree.el
@@ -598,6 +598,8 @@ message will be \"unarchived\", i.e. the tag changes in
 (defun notmuch-tree-refresh-view ()
   "Refresh view."
   (interactive)
+  (when (get-buffer-process (current-buffer))
+    (error "notmuch tree process already running for current buffer"))
   (let ((inhibit-read-only t)
        (basic-query notmuch-tree-basic-query)
        (query-context notmuch-tree-query-context)
-- 
2.13.3

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