Patch 8.2.2649
Problem:    Vim9: some wincmd arguments cause a white space error.
Solution:   Insert a space before the count. (closes #8001)
Files:      src/window.c, src/testdir/test_vim9_cmd.vim


*** ../vim-8.2.2648/src/window.c        2021-03-13 14:28:59.339594607 +0100
--- src/window.c        2021-03-24 20:04:50.397247408 +0100
***************
*** 750,760 ****
      size_t    bufsize,
      long      Prenum)
  {
-     size_t    len = STRLEN(cmd);
- 
-     STRCPY(bufp, cmd);
      if (Prenum > 0)
!       vim_snprintf((char *)bufp + len, bufsize - len, "%ld", Prenum);
  }
  
  /*
--- 750,759 ----
      size_t    bufsize,
      long      Prenum)
  {
      if (Prenum > 0)
!       vim_snprintf((char *)bufp, bufsize, "%s %ld", cmd, Prenum);
!     else
!       STRCPY(bufp, cmd);
  }
  
  /*
*** ../vim-8.2.2648/src/testdir/test_vim9_cmd.vim       2021-03-14 
13:21:31.789065156 +0100
--- src/testdir/test_vim9_cmd.vim       2021-03-24 20:06:37.972974627 +0100
***************
*** 1056,1061 ****
--- 1056,1082 ----
    endif
    assert_notequal(id1, win_getid())
    close
+ 
+   split
+   var id = win_getid()
+   split
+   :2wincmd o
+   assert_equal(id, win_getid())
+   only
+ 
+   split
+   split
+   assert_equal(3, winnr('$'))
+   :2wincmd c
+   assert_equal(2, winnr('$'))
+   only
+ 
+   split
+   split
+   assert_equal(3, winnr('$'))
+   :2wincmd q
+   assert_equal(2, winnr('$'))
+   only
  enddef
  
  def Test_windo_missing_endif()
*** ../vim-8.2.2648/src/version.c       2021-03-23 19:22:08.942052565 +0100
--- src/version.c       2021-03-24 19:57:59.770306042 +0100
***************
*** 752,753 ****
--- 752,755 ----
  {   /* Add new patch number below this line */
+ /**/
+     2649,
  /**/

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