vim-patch:8.2.2128: there is no way to do something on CTRL-Z (#39440)

Problem:    There is no way to do something on CTRL-Z.
Solution:   Add VimSuspend and VimResume autocommand events. (closes vim/vim#7450)

100118c73a

----

Nvim implemented these events first and has enough tests.
test_suspend.vim relies on Vim 'terminal' feature.
Treat it as N/A even if all tests could be ported as Lua functional
screen/terminal tests.

----

Co-authored-by: Bram Moolenaar <Bram@vim.org>

scripts/vim_na_files.txt

@@ -116,6 +116,7 @@ src/testdir/test_remote.vim
 src/testdir/test_restricted.vim
 src/testdir/test_short_sleep.py
 src/testdir/test_shortpathname.vim
+src/testdir/test_suspend.vim
 src/testdir/test_tcl.vim
 src/testdir/test_termencoding.vim
 src/testdir/test_xdg.vim

src/nvim/normal.c

@@ -5178,7 +5178,7 @@ static void nv_suspend(cmdarg_T *cap)
   if (VIsual_active) {
     end_visual_mode();                  // stop Visual mode
   }
-  do_cmdline_cmd("st");
+  do_cmdline_cmd("stop");
 }
 
 /// "gv": Reselect the previous Visual area.  If Visual already active,

test/old/testdir/test_suspend.vim

@@ -1,63 +0,0 @@
-" Test :suspend
-
-source shared.vim
-source term_util.vim
-
-func CheckSuspended(buf, fileExists)
-  call WaitForAssert({-> assert_match('[$#] $', term_getline(a:buf, '.'))})
-
-  if a:fileExists
-    call assert_equal(['foo'], readfile('Xfoo'))
-  else
-    " Without 'autowrite', buffer should not be written.
-    call assert_equal(0, filereadable('Xfoo'))
-  endif
-
-  call term_sendkeys(a:buf, "fg\<CR>\<C-L>")
-  call WaitForAssert({-> assert_equal('  1 foo', term_getline(a:buf, '.'))})
-endfunc
-
-func Test_suspend()
-  if !has('terminal') || !executable('/bin/sh')
-    return
-  endif
-
-  let buf = term_start('/bin/sh')
-  " Wait for shell prompt.
-  call WaitForAssert({-> assert_match('[$#] $', term_getline(buf, '.'))})
-
-  call term_sendkeys(buf, GetVimCommandClean()
-        \               . " -X"
-        \               . " -c 'set nu'"
-        \               . " -c 'call setline(1, \"foo\")'"
-        \               . " Xfoo\<CR>")
-  " Cursor in terminal buffer should be on first line in spawned vim.
-  call WaitForAssert({-> assert_equal('  1 foo', term_getline(buf, '.'))})
-
-  for suspend_cmd in [":suspend\<CR>",
-        \             ":stop\<CR>",
-        \             ":suspend!\<CR>",
-        \             ":stop!\<CR>",
-        \             "\<C-Z>"]
-    " Suspend and wait for shell prompt.
-    call term_sendkeys(buf, suspend_cmd)
-    call CheckSuspended(buf, 0)
-  endfor
-
-  " Test that :suspend! with 'autowrite' writes content of buffers if modified.
-  call term_sendkeys(buf, ":set autowrite\<CR>")
-  call assert_equal(0, filereadable('Xfoo'))
-  call term_sendkeys(buf, ":suspend\<CR>")
-  " Wait for shell prompt.
-  call CheckSuspended(buf, 1)
-
-  " Quit gracefully to dump coverage information.
-  call term_sendkeys(buf, ":qall!\<CR>")
-  call TermWait(buf)
-  " Wait until Vim actually exited and shell shows a prompt
-  call WaitForAssert({-> assert_match('[$#] $', term_getline(buf, '.'))})
-  call StopShellInTerminal(buf)
-
-  exe buf . 'bwipe!'
-  call delete('Xfoo')
-endfunc