regression: vector layer legend symbol / children (i.e. rules) aren't shown when in group

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)
Original Redmine Issue: 19199
Affected QGIS version: 3.1(master)
Redmine category:vectors
Assignee: Alessandro Pasotti

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I've just noticed that QGIS master (what'll become 3.2) suffers from the following regression: upon project load, vector layers that are children of groups do not have legend symbols (i.e., the default vector geometry icon is used instead of the symbol), and layers' children (for e.g. rules in the rule-based renderer) are also missing.

Steps to reproduce

1. Load the attached project
2. Note the absence of legend symbol and children in the layers panel

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• test3.qgz (Mathieu Pellerin - nIRV)

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)

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git bisect's verdict:

2f2221aec7a12138dacccd40ac3a34573e3a5da3 is the first bad commit
commit 2f2221aec7a12138dacccd40ac3a34573e3a5da3
Author: Alessandro Pasotti <elpaso@itopen.it>
Date:   Thu Jun 7 08:16:11 2018 +0200

    Do not return invalid layers from findLayers()

:040000 040000 b8d3c7390fef62c4dac38d0bc2498c7db007f585 166aeac123aafb1cf956ee7924127541d578c2f2 M	src

[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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• assigned_to_id was configured as Alessandro Pasotti

[qgib]

Author Name: Anónimo (Anónimo)

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Applied in changeset 59fa2ce.

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• done_ratio was changed from 0 to 100
• status_id was changed from Open to Closed