Patch 8.1.2227
Problem:    Layout wrong if 'lines' changes while cmdline window is open.
Solution:   Do not restore the window layout if 'lines' changed.
            (closes #5130)
Files:      src/window.c, src/testdir/test_cmdline.vim,
            src/testdir/dumps/Test_cmdwin_restore_1.dump,
            src/testdir/dumps/Test_cmdwin_restore_2.dump,
            src/testdir/dumps/Test_cmdwin_restore_3.dump


*** ../vim-8.1.2226/src/window.c        2019-10-17 22:58:59.070496999 +0200
--- src/window.c        2019-10-27 20:32:12.013378147 +0100
***************
*** 5177,5193 ****
      win_T     *wp;
  
      ga_init2(gap, (int)sizeof(int), 1);
!     if (ga_grow(gap, win_count() * 2) == OK)
        FOR_ALL_WINDOWS(wp)
        {
            ((int *)gap->ga_data)[gap->ga_len++] =
                                               wp->w_width + wp->w_vsep_width;
            ((int *)gap->ga_data)[gap->ga_len++] = wp->w_height;
        }
  }
  
  /*
!  * Restore window sizes, but only if the number of windows is still the same.
   * Does not free the growarray.
   */
      void
--- 5177,5199 ----
      win_T     *wp;
  
      ga_init2(gap, (int)sizeof(int), 1);
!     if (ga_grow(gap, win_count() * 2 + 1) == OK)
!     {
!       // first entry is value of 'lines'
!       ((int *)gap->ga_data)[gap->ga_len++] = Rows;
! 
        FOR_ALL_WINDOWS(wp)
        {
            ((int *)gap->ga_data)[gap->ga_len++] =
                                               wp->w_width + wp->w_vsep_width;
            ((int *)gap->ga_data)[gap->ga_len++] = wp->w_height;
        }
+     }
  }
  
  /*
!  * Restore window sizes, but only if the number of windows is still the same
!  * and 'lines' didn't change.
   * Does not free the growarray.
   */
      void
***************
*** 5196,5208 ****
      win_T     *wp;
      int               i, j;
  
!     if (win_count() * 2 == gap->ga_len)
      {
        /* The order matters, because frames contain other frames, but it's
         * difficult to get right. The easy way out is to do it twice. */
        for (j = 0; j < 2; ++j)
        {
!           i = 0;
            FOR_ALL_WINDOWS(wp)
            {
                frame_setwidth(wp->w_frame, ((int *)gap->ga_data)[i++]);
--- 5202,5215 ----
      win_T     *wp;
      int               i, j;
  
!     if (win_count() * 2 + 1 == gap->ga_len
!           && ((int *)gap->ga_data)[0] == Rows)
      {
        /* The order matters, because frames contain other frames, but it's
         * difficult to get right. The easy way out is to do it twice. */
        for (j = 0; j < 2; ++j)
        {
!           i = 1;
            FOR_ALL_WINDOWS(wp)
            {
                frame_setwidth(wp->w_frame, ((int *)gap->ga_data)[i++]);
***************
*** 6374,6380 ****
  }
  
  /*
!  * Return TRUE if there is only one window (in the current tab page), not
   * counting a help or preview window, unless it is the current window.
   * Does not count unlisted windows.
   */
--- 6381,6387 ----
  }
  
  /*
!  * Return TRUE if there is only one window and only one tab page, not
   * counting a help or preview window, unless it is the current window.
   * Does not count unlisted windows.
   */
*** ../vim-8.1.2226/src/testdir/test_cmdline.vim        2019-10-27 
05:12:38.284773720 +0100
--- src/testdir/test_cmdline.vim        2019-10-27 20:30:48.077663764 +0100
***************
*** 768,773 ****
--- 768,803 ----
    bw!
  endfunc
  
+ func Test_cmdwin_restore()
+   CheckScreendump
+ 
+   let lines =<< trim [SCRIPT]
+     call setline(1, range(30))
+     2split
+   [SCRIPT]
+   call writefile(lines, 'XTest_restore')
+ 
+   let buf = RunVimInTerminal('-S XTest_restore', {'rows': 12})
+   call term_wait(buf, 100)
+   call term_sendkeys(buf, "q:")
+   call VerifyScreenDump(buf, 'Test_cmdwin_restore_1', {})
+ 
+   " normal restore
+   call term_sendkeys(buf, ":q\<CR>")
+   call VerifyScreenDump(buf, 'Test_cmdwin_restore_2', {})
+ 
+   " restore after setting 'lines' with one window
+   call term_sendkeys(buf, ":close\<CR>")
+   call term_sendkeys(buf, "q:")
+   call term_sendkeys(buf, ":set lines=18\<CR>")
+   call term_sendkeys(buf, ":q\<CR>")
+   call VerifyScreenDump(buf, 'Test_cmdwin_restore_3', {})
+ 
+   " clean up
+   call StopVimInTerminal(buf)
+   call delete('XTest_restore')
+ endfunc
+ 
  func Test_buffers_lastused()
    " check that buffers are sorted by time when wildmode has lastused
    call test_settime(1550020000)         " middle
*** ../vim-8.1.2226/src/testdir/dumps/Test_cmdwin_restore_1.dump        
2019-10-27 20:35:18.344729001 +0100
--- src/testdir/dumps/Test_cmdwin_restore_1.dump        2019-10-27 
20:18:24.807814302 +0100
***************
*** 0 ****
--- 1,12 ----
+ |0+0&#ffffff0| @73
+ |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @43|1|,|1| @11|T|o|p
+ |0+0&&| @73
+ |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @43|1|,|1| @11|T|o|p
+ |:+0#4040ff13&> +0#0000000&@73
+ |~+0#4040ff13&| @73
+ |~| @73
+ |~| @73
+ |~| @73
+ |~| @73
+ |[+3#0000000&|C|o|m@1|a|n|d| |L|i|n|e|]| @42|1|,|0|-|1| @9|A|l@1
+ |:+0&&| @73
*** ../vim-8.1.2226/src/testdir/dumps/Test_cmdwin_restore_2.dump        
2019-10-27 20:35:18.348728987 +0100
--- src/testdir/dumps/Test_cmdwin_restore_2.dump        2019-10-27 
20:18:25.859812073 +0100
***************
*** 0 ****
--- 1,12 ----
+ >0+0&#ffffff0| @73
+ |1| @73
+ |[+3&&|N|o| |N|a|m|e|]| |[|+|]| @43|1|,|1| @11|T|o|p
+ |0+0&&| @73
+ |1| @73
+ |2| @73
+ |3| @73
+ |4| @73
+ |5| @73
+ |6| @73
+ |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @43|1|,|1| @11|T|o|p
+ | +0&&@74
*** ../vim-8.1.2226/src/testdir/dumps/Test_cmdwin_restore_3.dump        
2019-10-27 20:35:18.352728973 +0100
--- src/testdir/dumps/Test_cmdwin_restore_3.dump        2019-10-27 
20:30:55.017640334 +0100
***************
*** 0 ****
--- 1,18 ----
+ >0+0&#ffffff0| @73
+ |1| @73
+ |2| @73
+ |3| @73
+ |4| @73
+ |5| @73
+ |6| @73
+ |7| @73
+ |8| @73
+ |9| @73
+ |1|0| @72
+ |1@1| @72
+ |1|2| @72
+ |1|3| @72
+ |1|4| @72
+ |1|5| @72
+ |1|6| @72
+ @57|1|,|1| @10|T|o|p| 
*** ../vim-8.1.2226/src/version.c       2019-10-27 18:50:19.605873781 +0100
--- src/version.c       2019-10-27 20:08:16.777496203 +0100
***************
*** 743,744 ****
--- 743,746 ----
  {   /* Add new patch number below this line */
+ /**/
+     2227,
  /**/

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would make showering unnecessary.
                                (Scott Adams - The Dilbert principle)

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
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