layer fails to render when rule-based symbology make use of $atlasfeatureid

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)
Original Redmine Issue: 9459
Affected QGIS version: master
Redmine category:expressions
Assignee: Nathan Woodrow

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In an atlas-defined project, a layer that has a rule-based symbology that relies on the $atlasfeatureid will not render upon project loading. The user will have to enter the layer's property window, and click on apply / ok for the layer to start rendering.

A basic scenario that leads to this problem is when a user will use a $id = $atlasfeatureid / $id != $atlasfeatureid set of rule to highlight the atlas feature on the map.

It's a bit of an odd one, so I'll let the attached test project showcase the problem.

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• error_expression.zip (Mathieu Pellerin - nIRV)

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• fixed_version_id was changed from Version 2.0.0 to Future Release - High Priority

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Think this should be a blocker, since it's a new feature which isn't working as expected.

I had a go at fixing it by making sure that $atlasfeatureid is set to 0 when an atlas based composition is first loaded, but this fix didn't work since the map has already been rendered by the time the composition is loaded.

I think this global variable needs to be set to 0 when a project is loaded but before any map is rendered.

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• priority_id was changed from Normal to Severe/Regression

[qgib]

Author Name: Martin Dobias (@wonder-sk)

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Fixed in changeset "684dd890a3359a2fb189b289b0bb65a42a9f4105".

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• status_id was changed from Open to Closed