patch 8.0.0499: taglist() does not prioritize tags for a buffer

Problem:    taglist() does not prioritize tags for a buffer.
Solution:   Add an optional buffer argument. (Duncan McDougall, closes #1194)
diff --git a/src/testdir/test_alot.vim b/src/testdir/test_alot.vim
index 314a5b7..7b31575 100644
--- a/src/testdir/test_alot.vim
+++ b/src/testdir/test_alot.vim
@@ -47,6 +47,7 @@
 source test_tabpage.vim
 source test_tagcase.vim
 source test_tagjump.vim
+source test_taglist.vim
 source test_timers.vim
 source test_true_false.vim
 source test_unlet.vim