[vim/vim] statusline: cell below the vertical separator keeps the old highlight (PR #20949)

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```
Problem:  When 'statusline' is set, the cell below a vertical separator keeps
          the highlight of the previous status line update and only catches
          up on the next key press.
Solution: Also update that cell when the status line of the current window is
          redrawn while showing the ruler.
```

fixes: #20948
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20949

-- Commit Summary --

  * statusline: cell below the vertical separator keeps the old highlight

-- File Changes --

    M src/drawscreen.c (15)
    A src/testdir/dumps/Test_statusline_vsep_borrow_hl_mode_01.dump (6)
    A src/testdir/dumps/Test_statusline_vsep_borrow_hl_mode_02.dump (6)
    M src/testdir/test_statusline.vim (34)

-- Patch Links --

https://github.com/vim/vim/pull/20949.patch
https://github.com/vim/vim/pull/20949.diff

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<pre class=3D"notranslate"><code class=3D"notranslate">Problem:  When 'stat=
usline' is set, the cell below a vertical separator keeps
          the highlight of the previous status line update and only catches
          up on the next key press.
Solution: Also update that cell when the status line of the current window =
is
          redrawn while showing the ruler.
</code></pre>
<p dir=3D"auto"><span class=3D"issue-keyword tooltipped tooltipped-se" aria=
-label=3D"This pull request closes issue #20948.">fixes</span>: <a class=3D=
"issue-link js-issue-link" data-error-text=3D"Failed to load title" data-id=
=3D"5068655851" data-permission-text=3D"Title is private" data-url=3D"https=
://github.com/vim/vim/issues/20948" data-hovercard-type=3D"issue" data-hove=
rcard-url=3D"/vim/vim/issues/20948/hovercard" href=3D"https://github.com/vi=
m/vim/issues/20948">#20948</a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>&nbsp;&nbsp;<a href=3D'https://github.com/vim/vim/pull/20949'>https://gi=
thub.com/vim/vim/pull/20949</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href=3D"https://github.com/vim/vim/pull/20949/commits/c3480ab14e2b=
7a94f6b5b9129c07c9a6f1559d44" class=3D"commit-link">c3480ab</a>  statusline=
: cell below the vertical separator keeps the old highlight</li>
</ul>

<h4 style=3D"display: inline-block">File Changes </h4> <p style=3D"display:=
 inline-block">(<a href=3D"https://github.com/vim/vim/pull/20949/files">4&n=
bsp;files</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href=3D"https://github.com/vim/vim/pull/20949/files#diff-f6356031624=
eb43f2abdcb3c781a3dbf6fb8e9eda73ea8e9de86746d6df2c30d">src/drawscreen.c</a>
    (15)
  </li>
  <li>
    <strong>A</strong>
    <a href=3D"https://github.com/vim/vim/pull/20949/files#diff-bfcdc142f52=
191afea454d8b9abf868407d41120577088adc64d2ac2b02c11f0">src/testdir/dumps/Te=
st_statusline_vsep_borrow_hl_mode_01.dump</a>
    (6)
  </li>
  <li>
    <strong>A</strong>
    <a href=3D"https://github.com/vim/vim/pull/20949/files#diff-33b2330d11c=
5b7ffeaec87d768e4d896d65bfa9c6fe95fd1e98e6ecab00eb72c">src/testdir/dumps/Te=
st_statusline_vsep_borrow_hl_mode_02.dump</a>
    (6)
  </li>
  <li>
    <strong>M</strong>
    <a href=3D"https://github.com/vim/vim/pull/20949/files#diff-8eef7ef77a1=
987dddb38f72dca222bcba95de139a66a2f56d4913986e4882250">src/testdir/test_sta=
tusline.vim</a>
    (34)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href=3D'https://github.com/vim/vim/pull/20949.patch'>https://githu=
b.com/vim/vim/pull/20949.patch</a></li>
  <li><a href=3D'https://github.com/vim/vim/pull/20949.diff'>https://github=
.com/vim/vim/pull/20949.diff</a></li>
</ul>

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