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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 - regression/3d boxes extrusions broken in head"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=139887">139887</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>regression/3d boxes extrusions broken in head
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>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>graphics stack
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>freedesktop@treblig.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=169123" name="attach_169123" title="screenshot showing the bad cube">attachment 169123</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=169123&action=edit" title="screenshot showing the bad cube">[details]</a></span>
screenshot showing the bad cube

git bisect says it's due to:
commit 508c2e4a2d2b26d6b1842ff98e9aaa4d3adddf80 (HEAD, refs/bisect/bad)
Author: Noel Grandin <<a href="mailto:noelgrandin@gmail.com">noelgrandin@gmail.com</a>>
Date:   Sat Jan 16 11:52:40 2021 +0200

    transparency->alpha in vcl::RawBitmap

    Change-Id: I68e05555518f0dc6a7c01d2fec734b0d0aff0d48
    Reviewed-on: <a href="https://gerrit.libreoffice.org/c/core/+/109427">https://gerrit.libreoffice.org/c/core/+/109427</a>
    Tested-by: Noel Grandin <<a href="mailto:noel.grandin@collabora.co.uk">noel.grandin@collabora.co.uk</a>>
    Reviewed-by: Noel Grandin <<a href="mailto:noel.grandin@collabora.co.uk">noel.grandin@collabora.co.uk</a>>


1) Start impress
2) Select favourite template
3) Click the shaded cube
4) See something odd (see attachment) rather than the expected nice shaded 3d
cube

(Host: Linux Fedora 33)</pre>
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      </p>


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