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      <base href="https://bugs.webkit.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Display list iteration should automatically stop iterating if an item is null"
   href="https://bugs.webkit.org/show_bug.cgi?id=234318">234318</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Display list iteration should automatically stop iterating if an item is null
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>gnavamarino@apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>We should consider modifying DisplayList::Iterator::operator== so display list iteration automatically stops iterating if an item is null.

As was previously recommended, this can be done by making DisplayList::Iterator::operator== return true when called with a null iterator and the end iterator by changing
```
bool operator==(const Iterator& other) const { return &m_displayList == &other.m_displayList && m_cursor == other.m_cursor; }
```

to
```
bool operator==(const Iterator& other) const
{
    if (atEnd() && other.atEnd())
        return true;
    return &m_displayList == &other.m_displayList && m_cursor == other.m_cursor;
}
```

This requires updating the following two API tests:
- TestWebKitAPI.DisplayListTests.InlineItemValidationFailure
- TestWebKitAPI.DisplayListTests.OutOfLineItemDecodingFailure</pre>
        </div>
      </p>


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