Diagrams should use Column names instead of Column number

[qgib]

Author Name: Hien TRAN-QUANG (Hien TRAN-QUANG)
Original Redmine Issue: 7914
Affected QGIS version: master
Redmine category:symbology

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In master, I made a layer with diagrams, with fields A,B,C

For some reasons, I added some columns in my table I recreated from scratch (via pgscript), with fields A,A1,A2,B,B1,B2,C,C1,C2
The resulting diagrams use A, A1, A2 fields. So it seems that column numbers are used instead of names.

[qgib]

Author Name: Salvatore Larosa (@slarosa)

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• priority_id was changed from Normal to Severe/Regression

[qgib]

Author Name: Matthias Kuhn (@m-kuhn)

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Fixed in changeset "cad339d3cfde3c89e21d67d25222c6e26655d502".

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• status_id was changed from Open to Closed

[qgib]

Author Name: Matthias Kuhn (@m-kuhn)

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Not sure if it really solves your case. A real solution would require refactoring quite a couple of classes.