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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - qt5/kf5: Broken rendering e.g. after using Calc's Borders toolbar item"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=143334">143334</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>qt5/kf5: Broken rendering e.g. after using Calc's Borders toolbar item
          </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>m.weghorn@posteo.de
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="https://bugs.documentfoundation.org/attachment.cgi?id=173530" name="attach_173530" title="Screencast">attachment 173530</a> <a href="https://bugs.documentfoundation.org/attachment.cgi?id=173530&action=edit" title="Screencast">[details]</a></span>
Screencast

Steps to reproduce:

0) use qt5 or kf5 VCL plugin (SAL_USE_VCLPLUGIN=qt5 or SAL_USE_VCLPLUGIN=kf5) 
1) start LO Calc
2) in the formatting toolbar, open the "Borders" popup (either by mouse klick
or using keyboard)
3) Click e.g. on the second item in the list ("Set left border only")
4) Press "Alt"

Result:

in step 3: Rendering is broken, some areas no more painted
in step 4: Even more areas no more painted

The attached screenshot shows the problem.

Version: 7.3.0.0.alpha0+ / LibreOffice Community
Build ID: 0fc020fb73c86a20608e8dff12af607e60327379
CPU threads: 12; OS: Linux 5.10; UI render: default; VCL: kf5 (cairo+xcb)
Locale: en-GB (en_GB.UTF-8); UI: en-US
Calc: threaded</pre>
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