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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Andreas,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I can confirm your issue. If I change the rendering order in a 2.18 qgs project and open it in 3.0, the checkbox "Control rendering order" is set
to “off” and the ordering is “reset” to the rendering order in the “layers” panel.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Burghardt<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> QGIS-Developer [mailto:qgis-developer-bounces@lists.osgeo.org]
<b>Im Auftrag von </b>Andreas Neumann<br>
<b>Gesendet:</b> Mittwoch, 4. April 2018 11:45<br>
<b>An:</b> QGIS Developers List<br>
<b>Betreff:</b> [QGIS-Developer] Alternative layer drawing order not honoured in QGIS 3<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Hi,<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">I know that probably not many people use the feature of the "alternative drawing order" in QGIS - it is kind of a hidden - not so well-known feature. Normally, QGIS is using the layer rendering
order defined in the "Layers" panel. But one can deliberately reorganize the layer rendering order in the separate "Layer Order" panel. This is necessary for more complex cartographic output (e.g. cadastral maps).<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">I noticed that an existing 2.18 qgs project opened in 3.0 does two bad things:<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">1. the checkbox "Control rendering order" in the "Layer Order" panel is set to "off" in QGIS 3, whereas it was on in 2.18<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">2. the ordering in the Layer Order panel is completeley mixed up (not as it was in 2.18).<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">I think that this a very important issue to fix for any serious cartographic output involving many layers.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">My questions:<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">1. Can others confirm that issue, that the layer drawing order is messed up when opening 2.18 files that had alternative layer orders defined?<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">2. Who has time and expertise in this code area to fix this issue?<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">I can provide a Postgis-Dump and a sample project that demonstrates this issue.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">See also the screenshot at <a href="https://issues.qgis.org/attachments/download/12554/layer_rendering_order_garbled.png">https://issues.qgis.org/attachments/download/12554/layer_rendering_order_garbled.png</a> showing
the issue - on the left is QGIS 2.18 on the right there is QGIS 3.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Issue report at <a href="https://issues.qgis.org/issues/18620">https://issues.qgis.org/issues/18620</a> <o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Thanks for your replies,<br>
Andreas<o:p></o:p></span></p>
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