Results of intersects geotraitement tools are not the same between 2.18 and 3.2.3

[qgib]

Author Name: Florent LUQUET (Florent LUQUET)
Original Redmine Issue: 19908
Affected QGIS version: 3.2.3
Redmine category:vectors

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The tool "Select by location" into "Processing Toolbox" responds a wrong result on the 3.2.3 version. See below the attachements images.
The data are polygons (not multi polygons) with the same CRS.

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• QGIS 2.18.22 - Good intersects result.png (Florent LUQUET)
• QGIS 3.2.3 - Error intersects result.png (Florent LUQUET)
• indicateur_3.gpkg (Florent LUQUET)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Please attach the sample data used.

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Florent LUQUET (Florent LUQUET)

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Ok. Data into a geopackage attachement. Thanks

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• 13342 was configured as indicateur_3.gpkg

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• indicateur_3.gpkg (Florent LUQUET)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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I've investigated and the cause of this issue is that the geometries in dalle_litto_3d are all invalid -- the polygon rings are not closed. This also causes issues with other QGIS tools, e.g. you can't click to select polygons in this layer or use the identify tool on them. The solution is to run the "repair geometries" algorithm over this layer to fix the geometries.

I'm curious how this layer was built though -- if it was the result of a QGIS algorithm or operation then that needs fixing to output valid polygons.

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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• resolution was changed from to no timely feedback
• status_id was changed from Feedback to Closed