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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 - missing grid pixels ..."
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=128713">128713</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>missing grid pixels ...
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>6.4.0.0.alpha0+
          </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>major
          </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>michael.meeks@collabora.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>This is as discussed in:

<a href="https://gerrit.libreoffice.org/#/c/82221/">https://gerrit.libreoffice.org/#/c/82221/</a>

which (apart from the patch expanding the area in totally the wrong place -
should be after we check for empty or before the intersection) - seems to
rather help.

bin/run tilebench `pwd`/instdir/program
libreofficekit/qa/data/join/calc-100-textjitter.xlsx --join

with the patch:

        Zoom 0.5 bad tiles: 2 with 228 mismatching pixels
        Zoom 0.85 bad tiles: 1 with 171 mismatching pixels
        Zoom 1 bad tiles: 1 with 103 mismatching pixels

without the patch:

        Zoom 0.5 bad tiles: 64 with 1227 mismatching pixels
        Zoom 0.6 bad tiles: 64 with 1227 mismatching pixels
        Zoom 0.7 bad tiles: 64 with 1456 mismatching pixels
        Zoom 0.85 bad tiles: 64 with 1978 mismatching pixels
        Zoom 1 bad tiles: 64 with 2215 mismatching pixels
        Zoom 1.2 bad tiles: 64 with 2609 mismatching pixels
        Zoom 1.5 bad tiles: 64 with 3023 mismatching pixels
        Zoom 1.75 bad tiles: 64 with 4039 mismatching pixels
        Zoom 2 bad tiles: 64 with 4406 mismatching pixels

So ~all tiles are bad there I think. I attach a picture of the:

/tmp/dump_tile_diff to show the fun =)</pre>
        </div>
      </p>


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