Vim: Respect excluded tags when showing a thread

Other queries have exclude_tags taken into account but this one.
This is annoying when using an excluded tag to ignore past messages from a
thread (for example the 'deleted' tag), the entire thread is shown all the
time.

NEWS

@@ -1,3 +1,11 @@
+Notmuch 0.33 (UNRELEASED)
+=========================
+
+Vim
+---
+
+Respect excluded tags when showing a thread.
+
 Notmuch 0.32 (UNRELEASED)
 =========================
 

vim/notmuch.vim

@@ -317,6 +317,9 @@ ruby << EOF
 	$curbuf.render do |b|
 		q = $curbuf.query(get_cur_view)
 		q.sort = Notmuch::SORT_OLDEST_FIRST
+		$exclude_tags.each { |t|
+			q.add_tag_exclude(t)
+		}
 		msgs = q.search_messages
 		msgs.each do |msg|
 			m = Mail.read(msg.filename)