[Diagrams] Show diagram data-defined option seems broken

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 19109
Affected QGIS version: 3.1(master)
Redmine category:diagrams

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In the layer properties dialog, Diagrams --> Rendering tab, if I apply to the "Show diagram" data-defined widget the following expression @"CODE_DEPT" = '52'@ it show the diagram for the corresponding feature.
But if I write @"CODE_DEPT" > '52'@ it shows all features diagrams even those that do not fill the condition.

Moreover, I must admit that I fail to understand the subtlety between this option and the one next to it, ie "Always show" (which, btw does not seem to return expected result neither).

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• DEPARTEMENT.7z (Harrissou Santanna)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset b1c8949.

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