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    <p>Thank you for the feedback, Karl and Christoph.</p>
    <p>Your work around is valid. It is possible to transform the
      polygons into lines and then render them correctly.<br>
    </p>
    <p>It would be nice to have an option to render only once adjacent
      polygons, with a a common border.</p>
    <p>There is a "Feature request" by Miroslav Umlauf at:
      <a class="moz-txt-link-freetext" href="https://github.com/qgis/QGIS/issues/17943">https://github.com/qgis/QGIS/issues/17943</a></p>
    <p>I've added my use case.<br>
    </p>
    <p>Regards,</p>
    <p>Jorge<br>
    </p>
    <div class="moz-cite-prefix">On 11/06/20 12:18, Karl Magnus Jönsson
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:8dc60195238542758a7a30dda8e1dcf2@kristianstad.se">
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        <p class="MsoNormal"><a name="T_Default_Reply"
            moz-do-not-send="true"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi!<br>
              I had a similar problem. </span></a><span
            style="mso-bookmark:T_Default_Reply"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"
              lang="EN-GB">I’ve made a view ( in PostGIS) to transform
              the boundaries to lines and remove the duplicate lines.
              Should be doable in virtual layers as well. Quite
              complicated SQL since I have several different types of
              lines depending on the attributes.<o:p></o:p></span></span></p>
        <p class="MsoNormal"><span style="mso-bookmark:T_Default_Reply"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"
              lang="EN-GB"><o:p> </o:p></span></span></p>
        <div>
          <p class="MsoNormal"><span
              style="mso-bookmark:T_Default_Reply"><b><span
                  style="font-size:10.0pt;font-family:"Franklin
                  Gothic Book",sans-serif;color:black">Karl-Magnus
                  Jönsson</span></b></span><span
              style="mso-bookmark:T_Default_Reply"></span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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            <p class="MsoNormal"><b><span
                  style="font-size:11.0pt;font-family:"Calibri",sans-serif">Från:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
                Qgis-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-user-bounces@lists.osgeo.org"><qgis-user-bounces@lists.osgeo.org></a>
                <b>För </b>Christoph Jung<br>
                <b>Skickat:</b> den 11 juni 2020 13:11<br>
                <b>Till:</b> Jorge Gustavo Rocha
                <a class="moz-txt-link-rfc2396E" href="mailto:jgr@geomaster.pt"><jgr@geomaster.pt></a><br>
                <b>Kopia:</b> <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
                <b>Ämne:</b> Re: [Qgis-user] Styling polygon borders:
                preventing double rendering between polygons<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Hi Jorge,<o:p></o:p></p>
        <div>
          <p class="MsoNormal"><o:p> </o:p></p>
        </div>
        <div>
          <p class="MsoNormal">If it is just a visual thing, than you
            could transform your polygons to lines and delete the
            duplicate geometries.<o:p></o:p></p>
        </div>
        <div>
          <p class="MsoNormal"><o:p> </o:p></p>
        </div>
        <div>
          <p class="MsoNormal">Sincerely,<o:p></o:p></p>
        </div>
        <div>
          <p class="MsoNormal">Christoph<o:p></o:p></p>
          <div>
            <p class="MsoNormal"><br>
              <br>
              <o:p></o:p></p>
            <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
              <div>
                <p class="MsoNormal">Am 11.06.2020 um 12:45 schrieb
                  Jorge Gustavo Rocha <<a
                    href="mailto:jgr@geomaster.pt"
                    moz-do-not-send="true">jgr@geomaster.pt</a>>:<o:p></o:p></p>
              </div>
              <p class="MsoNormal"><o:p> </o:p></p>
              <div>
                <div>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi
                    QGisers,<o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I'm
                    trying to style a polygon layer (districts) using a
                    marker line (using the '+' sign). It works well for
                    lines.<o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">When
                    I use it in polygons, the outer line is ok, but the
                    lines between polygons are rendered twice.<o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">To
                    make this question more clear, I've attached the
                    following print screen:
                    <a
                      href="https://nextcloud.geomaster.pt/index.php/s/e3ztdJ894RCf9j6"
                      moz-do-not-send="true">https://nextcloud.geomaster.pt/index.php/s/e3ztdJ894RCf9j6</a><o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The
                    line near the sea is rendered just once. The line
                    going to east between the polygons is rendered
                    twice. We can see double '+'  on that line.<o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">How
                    do I render all the lines exactly the same way,
                    without this "double" rendering between polygons?<o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards,<o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Jorge
                    Gustavo<o:p></o:p></p>
                  <div>
                    <p class="MsoNormal">-- <o:p></o:p></p>
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                                    0cm 3.75pt 7.5pt" width="390"
                                    valign="top">
                                    <p class="MsoNormal"><strong><span
style="font-size:14.0pt;font-family:"Arial",sans-serif;color:#FB6303">Geomaster</span></strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0079AC"><br>
                                      </span><strong><span
style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#0079AC">Jorge
                                          Gustavo Rocha</span></strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0079AC">
                                      </span><span
style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#0079AC">|
                                        Software Engineer</span><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0079AC"><o:p></o:p></span></p>
                                  </td>
                                </tr>
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                                  <td style="padding:3.75pt 0cm 3.75pt
                                    7.5pt" valign="top">
                                    <p class="MsoNormal"
                                      style="line-height:12.75pt"><strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#FB6303">e:</span></strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#444444">
                                        <a
                                          href="mailto:jgr@geomaster.pt"
                                          moz-do-not-send="true">jgr@geomaster.pt</a>
                                        | </span><strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#FB6303">m:</span></strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#444444">
                                        +351 910 333 888<br>
                                      </span><strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#FB6303">g:</span></strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#444444">
                                        41.54094,-8.40490 |
                                      </span><strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#FB6303">v:
                                        </span></strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#444444">510
                                        906 109<br>
                                      </span><strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#FB6303">a:
                                        </span></strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#444444">Rua
                                        António Cândido Pinto, 67,
                                        4715-400 Braga<o:p></o:p></span></p>
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                <p class="MsoNormal">_______________________________________________<br>
                  Qgis-user mailing list<br>
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              </div>
            </blockquote>
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          <p class="MsoNormal"><o:p> </o:p></p>
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              Arial, sans-serif; border-right: 1px solid;
              border-right-color: #fb6303; width: 125px; padding-right:
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              valign="top"> <a href="https://www.geomaster.pt"
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                    <td style="font-size: 10pt; color:#0079ac;
                      font-family: Arial, sans-serif; width: 400px;
                      padding-bottom: 5px; padding-left: 10px;
                      vertical-align: top;" valign="top"> <strong><span
                          style="font-size: 14pt; font-family: Arial,
                          sans-serif; color:#fb6303;">Geomaster</span></strong><br>
                      <strong><span style="font-size: 11pt; font-family:
                          Arial, sans-serif; color:black;">Jorge Gustavo
                          Rocha</span></strong> <span
                        style="font-family: Arial, sans-serif;
                        font-size:11pt; color:#000000;"><span
                          style="padding-right: 5px; padding-left: 5px;">
                          | </span>Software Engineer</span> </td>
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                    <td style="font-size: 10pt; color:#444444;
                      font-family: Arial, sans-serif; padding-bottom:
                      5px; padding-top: 5px; padding-left: 10px;
                      vertical-align: top; line-height:17px;"
                      valign="top"> <span><span style="color: #fb6303;"><strong>e:</strong></span><span
                          style="font-size: 10pt; font-family: Arial,
                          sans-serif; color:#000000;"> <a class="moz-txt-link-abbreviated" href="mailto:jgr@geomaster.pt">jgr@geomaster.pt</a></span></span>
                      <span><span style="padding-left:
                          5px;padding-right: 5px;"> | </span><span
                          style="color: #fb6303;"><strong>m:</strong></span><span
                          style="font-size: 10pt; font-family: Arial,
                          sans-serif; color:#000000;"> +351 910 333 888<br>
                        </span></span> <span><span style="color:
                          #fb6303;"><strong>g:</strong></span><span
                          style="font-size: 10pt; font-family: Arial,
                          sans-serif; color:#000000;"> 41.54094,-8.40490</span></span>
                      <span><span style="padding-left:
                          7px;padding-right: 5px;"> | </span><span
                          style="color: #fb6303;"><strong>v: </strong></span><span
                          style="font-size: 10pt; font-family: Arial,
                          sans-serif; color:#000000; padding-left: 7px;">
                          510 906 109<br>
                        </span></span> <span> <span style="color:
                          #fb6303;"><strong>a: </strong></span> </span>
                      <span> <span style="font-size: 10pt; font-family:
                          Arial, sans-serif; color: #000000;"><span> </span>Rua
                          António Cândido Pinto, 67, 4715-400 Braga<br>
                        </span></span> </td>
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