vim-patch:7.4.1735

Problem:    It is not possible to only see part of the message history.  It is
            not possible to clear messages.
Solution:   Add a count to ":messages" and a clear argument. (Yasuhiro
            Matsumoto)

451f849fd6

src/nvim/ex_cmds.lua

@@ -1604,7 +1604,7 @@ return {
   },
   {
     command='messages',
-    flags=bit.bor(TRLBAR, CMDWIN),
+    flags=bit.bor(EXTRA, TRLBAR, RANGE, CMDWIN),
     addr_type=ADDR_LINES,
     func='ex_messages',
   },