patch 8.0.1651: cannot filter :ls output for terminal buffers

Problem:    Cannot filter :ls output for terminal buffers.
Solution:   Add flags for terminal buffers. (Marcin Szamotulski, closes #2751)

runtime/doc/windows.txt

@@ -1,4 +1,4 @@
*windows.txt*   For Vim version 8.0.  Last change: 2017 Sep 25
*windows.txt*   For Vim version 8.0.  Last change: 2018 Mar 29


		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -731,8 +731,7 @@ can also get to them with the buffer list commands, like ":bnext".
			the current window.
			{cmd} can contain '|' to concatenate several commands.
			{cmd} must not open or close windows or reorder them.
			{not in Vi} {not available when compiled without the
			|+listcmds| feature}
			{not in Vi}
			Also see |:tabdo|, |:argdo|, |:bufdo|, |:cdo|, |:ldo|,
			|:cfdo| and |:lfdo|

@@ -760,8 +759,7 @@ can also get to them with the buffer list commands, like ":bnext".
			autocommand event is disabled by adding it to
			'eventignore'.  This considerably speeds up editing
			each buffer.
			{not in Vi} {not available when compiled without the
			|+listcmds| feature}
			{not in Vi}
			Also see |:tabdo|, |:argdo|, |:windo|, |:cdo|, |:ldo|,
			|:cfdo| and |:lfdo|

@@ -974,7 +972,6 @@ is no word under the cursor, and a few other things: >
A hidden buffer is not displayed in a window, but is still loaded into memory.
This makes it possible to jump from file to file, without the need to read or
write the file every time you get another buffer in a window.
{not available when compiled without the |+listcmds| feature}

							*:buffer-!*
If the option 'hidden' ('hid') is set, abandoned buffers are kept for all
@@ -1049,6 +1046,9 @@ list of buffers. |unlisted-buffer|
		     x   buffers with a read error
		     %   current buffer
		     #   alternate buffer
		     R	 terminal buffers with a running job
		     F	 terminal buffers with a finished job
		     ?   terminal buffers without a job: `:terminal NONE`
		Combining flags means they are "and"ed together, e.g.:
		     h+   hidden buffers which are modified
		     a+   active buffers which are modified

src/buffer.c

@@ -2930,18 +2930,34 @@ buflist_list(exarg_T *eap)
    int		i;
    int		ro_char;
    int		changed_char;
#ifdef FEAT_TERMINAL
    int		job_running;
    int		job_none_open;
#endif

    for (buf = firstbuf; buf != NULL && !got_int; buf = buf->b_next)
    {
#ifdef FEAT_TERMINAL
	job_running = term_job_running(buf->b_term);
	job_none_open = job_running && term_none_open(buf->b_term);
#endif
	/* skip unlisted buffers, unless ! was used */
	if ((!buf->b_p_bl && !eap->forceit && !vim_strchr(eap->arg, 'u'))
		|| (vim_strchr(eap->arg, 'u') && buf->b_p_bl)
		|| (vim_strchr(eap->arg, '+')
			&& ((buf->b_flags & BF_READERR) || !bufIsChanged(buf)))
		|| (vim_strchr(eap->arg, 'a')
			 && (buf->b_ml.ml_mfp == NULL || buf->b_nwindows == 0))
			&& (buf->b_ml.ml_mfp == NULL || buf->b_nwindows == 0))
		|| (vim_strchr(eap->arg, 'h')
			 && (buf->b_ml.ml_mfp == NULL || buf->b_nwindows != 0))
			&& (buf->b_ml.ml_mfp == NULL || buf->b_nwindows != 0))
#ifdef FEAT_TERMINAL
		|| (vim_strchr(eap->arg, 'R')
			&& (!job_running || (job_running && job_none_open)))
		|| (vim_strchr(eap->arg, '?')
			&& (!job_running || (job_running && !job_none_open)))
		|| (vim_strchr(eap->arg, 'F')
			&& (job_running || buf->b_term == NULL))
#endif
		|| (vim_strchr(eap->arg, '-') && buf->b_p_ma)
		|| (vim_strchr(eap->arg, '=') && !buf->b_p_ro)
		|| (vim_strchr(eap->arg, 'x') && !(buf->b_flags & BF_READERR))

src/testdir/test_terminal.vim

@@ -45,11 +45,17 @@ func Test_terminal_basic()
  call assert_equal('t', mode())
  call assert_equal('yes', b:done)
  call assert_match('%aR[^\n]*running]', execute('ls'))
  call assert_match('%aR[^\n]*running]', execute('ls R'))
  call assert_notmatch('%[^\n]*running]', execute('ls F'))
  call assert_notmatch('%[^\n]*running]', execute('ls ?'))

  call Stop_shell_in_terminal(buf)
  call term_wait(buf)
  call assert_equal('n', mode())
  call assert_match('%aF[^\n]*finished]', execute('ls'))
  call assert_match('%aF[^\n]*finished]', execute('ls F'))
  call assert_notmatch('%[^\n]*finished]', execute('ls R'))
  call assert_notmatch('%[^\n]*finished]', execute('ls ?'))

  " closing window wipes out the terminal buffer a with finished job
  close

src/version.c

@@ -762,6 +762,8 @@ static char *(features[]) =

static int included_patches[] =
{   /* Add new patch number below this line */
/**/
    1651,
/**/
    1650,
/**/