patch 8.0.1642: running Vim in terminal fails with two windows

Problem:    Running Vim in terminal fails with two windows.
Solution:   Pass the number of rows to RunVimInTerminal().

src/testdir/screendump.vim

@@ -47,11 +47,17 @@ func RunVimInTerminal(arguments, options)
  set t_Co=256 background=light
  hi Normal ctermfg=NONE ctermbg=NONE

  " Make the window 20 lines high, unless told otherwise.
  let rows = 20
  if has_key(a:options, 'rows')
    let rows = a:options['rows']
  endif

  let cmd = GetVimCommandClean()
  " Add -v to have gvim run in the terminal (if possible)
  let cmd .= ' -v ' . a:arguments
  let buf = term_start(cmd, {'curwin': 1, 'term_rows': 20, 'term_cols': 75})
  call assert_equal([20, 75], term_getsize(buf))
  let buf = term_start(cmd, {'curwin': 1, 'term_rows': rows, 'term_cols': 75})
  call assert_equal([rows, 75], term_getsize(buf))

  return buf
endfunc

src/testdir/test_terminal.vim

@@ -1064,7 +1064,7 @@ func Test_terminal_api_drop_oldwin()
	\ 'redraw',
	\ "set t_ts=",
	\ ], 'Xscript')
  let buf = RunVimInTerminal('-S Xscript', {})
  let buf = RunVimInTerminal('-S Xscript', {'rows': 10})
  call WaitFor({-> expand('%:t') =='Xtextfile'})
  call assert_equal(textfile_winid, win_getid())

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =

static int included_patches[] =
{   /* Add new patch number below this line */
/**/
    1642,
/**/
    1641,
/**/