BadMethodCallException on nested html lists on valid HTML

[samimussbach]

Description

We did not consider nested html lists as edge case in #1239.
Additionally the markup in the Sample 26 is invalid. When nesting lists the <ol> should be in a <li> not outside (compare https://www.w3schools.com/html/html_lists.asp).

I corrected the documentation an added a test which fails with

BadMethodCallException : Cannot add ListItemRun in ListItemRun. /opt/Development/PHPWord/src/PhpWord/Element/AbstractContainer.php:230 /opt/Development/PHPWord/src/PhpWord/Element/AbstractContainer.php:130 /opt/Development/PHPWord/src/PhpWord/Element/AbstractContainer.php:112 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:438 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:163 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:195 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:177 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:440 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:163 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:195 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:177 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:195 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:177 /opt/Development/PHPWord/src/PhpWord/Shared/Html.php:70 /opt/Development/PHPWord/tests/PhpWord/Shared/HtmlTest.php:296

Assertions in Test are not correct yet, I did not know how the markup would be.

I see this PR as WIP, I think you are much faster in tackling this than me, hopefully this PR helps a bit.

Checklist:

• I have run composer check and no errors were reported
• The new code is covered by unit tests
• I have update the documentation to describe the changes

[troosan]

I think the correct HTML would be

<ol>
    <li><p style="font-weight: bold;">List 1 item 1</p></li>
    <li>List 1 item 2
        <ol>
            <li>sub list 1</li>
            <li>sub list 2</li>
        </ol>
    </li>
    <li>List 1 item 3</li>
</ol>

instead of

<ol>
    <li><p style="font-weight: bold;">List 1 item 1</p></li>
    <li>List 1 item 2</li>
    <li>
        <ol>
            <li>sub list 1</li>
            <li>sub list 2</li>
        </ol>
    </li>
    <li>List 1 item 3</li>
</ol>

[samimussbach]

Yes absolutely. This is how I updated the sample and the test

[troosan]

sorry, I wrongly copied your html code.
The nested list should be part of the second list item, not added to an additional list item

[samimussbach]

Your fix in #1273 works for us. Thank you very much!