[vim/vim] :redrawstatus does not update the ruler in the last line (PR #20865)

```
Problem:  When the last window has no status line the ruler is drawn in
          the last screen line, but ":redrawstatus" and re-setting
          'rulerformat' or 'statusline' do not update it there.  An item
          such as a clock in 'rulerformat' can therefore not be
          refreshed from a timer.
Solution: Also mark the last screen line for redrawing when the last
          window has no status line and 'ruler' is set.  Update the
          documentation and add a test.
```

related: https://groups.google.com/g/vim_use/c/VKCL2bH8xlk

---

Currently, this is possible with the following setting, but it only updates the status line of the current window when windows are split, and above all, it is not intuitive:

```vim
set ruler
set rulerformat=%55(%{strftime('%H:%M:%S')}\ %5l,%-6(%c%V%)\ %P%)
call timer_start(1000, {-> feedkeys("\<Ignore>", 'n')}, {'repeat': -1})
```

After applying this PR, it would be better to write the third line as follows:

```vim
call timer_start(1000, {-> execute(':redrawstatus!')}, {'repeat': -1})
```
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20865

-- Commit Summary --

  * :redrawstatus does not update the ruler in the last line

-- File Changes --

    M runtime/doc/various.txt (3)
    M src/drawscreen.c (14)
    M src/testdir/test_cmdline.vim (26)

-- Patch Links --

https://github.com/vim/vim/pull/20865.patch
https://github.com/vim/vim/pull/20865.diff

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