[vim/vim] textprop: wrong cursor line with truncated virtual text below an empty line (PR #20917)

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```
Problem:  The cursor is displayed in the wrong line when virtual text below
          an empty line is truncated.
Solution: Do not count an extra column for an empty line that has virtual
          text below it, its width already includes filling up the line.
```
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20917

-- Commit Summary --

  * textprop: wrong cursor line with truncated virtual text below an empty line

-- File Changes --

    M runtime/doc/todo.txt (1)
    M src/charset.c (12)
    M src/structs.h (2)
    M src/testdir/test_textprop.vim (21)

-- Patch Links --

https://github.com/vim/vim/pull/20917.patch
https://github.com/vim/vim/pull/20917.diff

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<pre class=3D"notranslate"><code class=3D"notranslate">Problem:  The cursor=
 is displayed in the wrong line when virtual text below
          an empty line is truncated.
Solution: Do not count an extra column for an empty line that has virtual
          text below it, its width already includes filling up the line.
</code></pre>

<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/20917'>https://gi=
thub.com/vim/vim/pull/20917</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href=3D"https://github.com/vim/vim/pull/20917/commits/bf9c6cd90028=
5b20c9a570bc49066eef4b1c5589" class=3D"commit-link">bf9c6cd</a>  textprop: =
wrong cursor line with truncated virtual text below an empty line</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/20917/files">4&n=
bsp;files</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href=3D"https://github.com/vim/vim/pull/20917/files#diff-fb7eed53e3f=
2993f9d82c748206eaca82fd1d054a417c6de477bb54373d85643">runtime/doc/todo.txt=
</a>
    (1)
  </li>
  <li>
    <strong>M</strong>
    <a href=3D"https://github.com/vim/vim/pull/20917/files#diff-c4d3af906cf=
f00cb5069b56dcf52a5b54e6f99ba0a32b37f48376eb4700d91d0">src/charset.c</a>
    (12)
  </li>
  <li>
    <strong>M</strong>
    <a href=3D"https://github.com/vim/vim/pull/20917/files#diff-6500c47e4af=
abd64a8cb2f853a4bc5e8c33f43814d3f9a0a9f4371025578a798">src/structs.h</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href=3D"https://github.com/vim/vim/pull/20917/files#diff-745bc1c7b61=
0a2e3c8047963b62119afca683765e872558fa6d14fe4c745fa38">src/testdir/test_tex=
tprop.vim</a>
    (21)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href=3D'https://github.com/vim/vim/pull/20917.patch'>https://githu=
b.com/vim/vim/pull/20917.patch</a></li>
  <li><a href=3D'https://github.com/vim/vim/pull/20917.diff'>https://github=
.com/vim/vim/pull/20917.diff</a></li>
</ul>

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