Patch 8.1.0171
Problem:    Typing CTRL-W n in a terminal window causes ml_get error.
Solution:   When resizing the terminal outside of terminal_loop() make sure
            the snapshot is complete.
Files:      src/terminal.c, src/testdir/test_terminal.vim


*** ../vim-8.1.0170/src/terminal.c      Sun Jul  8 16:50:33 2018
--- src/terminal.c      Sun Jul  8 20:48:42 2018
***************
*** 3134,3146 ****
  
      if (term->tl_rows != newrows || term->tl_cols != newcols)
      {
- 
- 
        term->tl_vterm_size_changed = TRUE;
        vterm_set_size(vterm, newrows, newcols);
        ch_log(term->tl_job->jv_channel, "Resizing terminal to %d lines",
                                                                      newrows);
        term_report_winsize(term, newrows, newcols);
      }
  
      /* The cursor may have been moved when resizing. */
--- 3134,3149 ----
  
      if (term->tl_rows != newrows || term->tl_cols != newcols)
      {
        term->tl_vterm_size_changed = TRUE;
        vterm_set_size(vterm, newrows, newcols);
        ch_log(term->tl_job->jv_channel, "Resizing terminal to %d lines",
                                                                      newrows);
        term_report_winsize(term, newrows, newcols);
+ 
+       // Updating the terminal size will cause the snapshot to be cleared.
+       // When not in terminal_loop() we need to restore it.
+       if (term != in_terminal_loop)
+           may_move_terminal_to_buffer(term, FALSE);
      }
  
      /* The cursor may have been moved when resizing. */
*** ../vim-8.1.0170/src/testdir/test_terminal.vim       Tue Jun 19 20:08:10 2018
--- src/testdir/test_terminal.vim       Sun Jul  8 20:46:08 2018
***************
*** 1525,1530 ****
--- 1525,1556 ----
    exe buf . 'bwipe!'
  endfunc
  
+ " Resizing the terminal window caused an ml_get error.
+ " TODO: This does not reproduce the original problem.
+ func Test_terminal_resize()
+   set statusline=x
+   terminal
+   call assert_equal(2, winnr('$'))
+ 
+   " Fill the terminal with text.
+   if has('win32')
+     call feedkeys("dir\<CR>", 'xt')
+   else
+     call feedkeys("ls\<CR>", 'xt')
+   endif
+   " Go to Terminal-Normal mode for a moment.
+   call feedkeys("\<C-W>N", 'xt')
+   " Open a new window
+   call feedkeys("i\<C-W>n", 'xt')
+   call assert_equal(3, winnr('$'))
+   redraw
+ 
+   close
+   call assert_equal(2, winnr('$'))
+   call feedkeys("exit\<CR>", 'xt')
+   set statusline&
+ endfunc
+ 
  " must be nearly the last, we can't go back from GUI to terminal
  func Test_zz1_terminal_in_gui()
    if !CanRunGui()
*** ../vim-8.1.0170/src/version.c       Sun Jul  8 19:07:16 2018
--- src/version.c       Sun Jul  8 20:46:58 2018
***************
*** 791,792 ****
--- 791,794 ----
  {   /* Add new patch number below this line */
+ /**/
+     171,
  /**/

-- 
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