vim-patch:8.1.1759: no mode char for terminal mapping from maparg()

Problem:    No mode char for terminal mapping from maparg().
Solution:   Check for TERMINAL mode. (closes vim/vim#4735)
14371ed697

src/nvim/getchar.c

@@ -3304,6 +3304,8 @@ char *map_mode_to_chars(int mode)
       ga_append(&mapmode, 'n');                         /* :nmap */
     if (mode & OP_PENDING)
       ga_append(&mapmode, 'o');                         /* :omap */
+    if (mode & TERM_FOCUS)
+      ga_append(&mapmode, 't');                         /* :tmap */
     if ((mode & (VISUAL + SELECTMODE)) == VISUAL + SELECTMODE)
       ga_append(&mapmode, 'v');                         /* :vmap */
     else {

src/nvim/testdir/test_maparg.vim

@@ -27,6 +27,10 @@ function Test_maparg()
   call assert_equal({'silent': 0, 'noremap': 0, 'lhs': 'foo', 'mode': ' ',
         \ 'nowait': 1, 'expr': 0, 'sid': sid, 'rhs': 'bar', 'buffer': 1},
         \ maparg('foo', '', 0, 1))
+  tmap baz foo
+  call assert_equal({'silent': 0, 'noremap': 0, 'lhs': 'baz', 'mode': 't',
+        \ 'nowait': 0, 'expr': 0, 'sid': sid, 'rhs': 'foo', 'buffer': 0},
+        \ maparg('baz', 't', 0, 1))
 
   map abc x<char-114>x
   call assert_equal("xrx", maparg('abc'))

test/functional/api/keymap_spec.lua

@@ -346,11 +346,6 @@ describe('nvim_set_keymap, nvim_del_keymap', function()
     to_return.sid = not opts.sid and 0 or opts.sid
     to_return.buffer = not opts.buffer and 0 or opts.buffer
 
-    -- mode 't' doesn't print when calling maparg
-    if mode == 't' then
-      to_return.mode = ''
-    end
-
     return to_return
   end