Patch 8.2.4248
Problem:    No proper test for moving the window separator.
Solution:   Add a test.  Add comment in code. (closes #9656)
Files:      src/window.c, src/testdir/test_window_cmd.vim


*** ../vim-8.2.4247/src/window.c        2022-01-28 15:28:00.216927600 +0000
--- src/window.c        2022-01-29 10:54:53.674796636 +0000
***************
*** 6187,6193 ****
      if (offset <= 0)          // No room at all, quit.
        return;
      if (fr == NULL)
!       return;                 // Safety check, should not happen.
  
      // grow frame fr by offset lines
      frame_new_width(fr, fr->fr_width + offset, left, FALSE);
--- 6187,6195 ----
      if (offset <= 0)          // No room at all, quit.
        return;
      if (fr == NULL)
!       // This can happen when calling win_move_separator() on the rightmost
!       // window.  Just don't do anything.
!       return;                 
  
      // grow frame fr by offset lines
      frame_new_width(fr, fr->fr_width + offset, left, FALSE);
*** ../vim-8.2.4247/src/testdir/test_window_cmd.vim     2022-01-10 
13:36:31.264892417 +0000
--- src/testdir/test_window_cmd.vim     2022-01-29 10:54:53.674796636 +0000
***************
*** 1424,1429 ****
--- 1424,1435 ----
      call assert_true(id->win_move_separator(-offset))
      call assert_equal(w, winwidth(id))
    endfor
+   " check win_move_separator from right window on right window is no-op
+   let w0 = winwidth(0)
+   call assert_true(win_move_separator(0, 1))
+   call assert_equal(w0, winwidth(0))
+   call assert_true(win_move_separator(0, -1))
+   call assert_equal(w0, winwidth(0))
    " check that win_move_separator doesn't error with offsets beyond moving
    " possibility
    call assert_true(win_move_separator(id, 5000))
***************
*** 1465,1470 ****
--- 1471,1489 ----
      call assert_true(win_move_statusline(1, -offset))
      call assert_equal(h, winheight(1))
    endfor
+   " check win_move_statusline from bottom window on bottom window
+   let h0 = winheight(0)
+   for offset in range(5)
+     call assert_true(0->win_move_statusline(-offset))
+     call assert_equal(h0 - offset, winheight(0))
+     call assert_equal(1 + offset, &cmdheight)
+     call assert_true(win_move_statusline(0, offset))
+     call assert_equal(h0, winheight(0))
+     call assert_equal(1, &cmdheight)
+   endfor
+   call assert_true(win_move_statusline(0, 1))
+   call assert_equal(h0, winheight(0))
+   call assert_equal(1, &cmdheight)
    " check win_move_statusline from bottom window on top window ID
    let id = win_getid(1)
    for offset in range(5)
*** ../vim-8.2.4247/src/version.c       2022-01-29 10:51:54.949759202 +0000
--- src/version.c       2022-01-29 10:58:24.015309957 +0000
***************
*** 752,753 ****
--- 752,755 ----
  {   /* Add new patch number below this line */
+ /**/
+     4248,
  /**/

-- 
THEOREM: VI is perfect.
PROOF: VI in roman numerals is 6.  The natural numbers < 6 which divide 6 are
1, 2, and 3. 1+2+3 = 6.  So 6 is a perfect number.  Therefore, VI is perfect.
QED
                                                    -- Arthur Tateishi

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///                                                                      \\\
\\\        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///

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