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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_UNCONFIRMED "
   title="UNCONFIRMED - Crash when using undo 3 times in comment reply"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=133348">133348</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Crash when using undo 3 times in comment reply
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>6.3.5.2 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Writer
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>tardos.tamas@protonmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Steps to reproduce:
- Open new Writer document
- Click Insert -> Comment
- Enter some text, e.g. "asdf"
- Click Tools -> Settings
- Change your first name or last name so that you are able to reply to the
previous comment
- Click OK
- Click the downward arrow on the comment, then click Reply
- Press CTRL-Z
- Press CTRL-Z
- Press CTRL-Z

Result:
First CTRL-Z removes automatically inserted reply related text from reply
comment,
second CTRL-Z doesn't do anything,
third CTRL-Z crashes Writer.

Expected result: 
One but maximum two CTRL-Z should remove my reply comment, no crash should
occur no matter how many times I press CTRL-Z.

Happens in both 6.3.5.2 and 7.0.0.0 Alpha 1.
Only tested on Windows.

Crash report for 6.3.5.2:
<a href="https://crashreport.libreoffice.org/stats/crash_details/b00f57c8-9339-4cae-864c-840a6f1e15fb#allthreads">https://crashreport.libreoffice.org/stats/crash_details/b00f57c8-9339-4cae-864c-840a6f1e15fb#allthreads</a>

Crash report for 7.0.0.0 Alpha 1:
<a href="https://crashreport.libreoffice.org/stats/crash_details/f108e603-bcf9-43c6-b395-abaa97069407">https://crashreport.libreoffice.org/stats/crash_details/f108e603-bcf9-43c6-b395-abaa97069407</a></pre>
        </div>
      </p>


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