Widget "Range": Representation for NULL value is NOT always displayed correctly

[qgib]

Author Name: Manuel K (Manuel K)
Original Redmine Issue: 18583
Affected QGIS version: master
Redmine category:forms
Assignee: Alessandro Pasotti

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Attribute of type integer;
DB: PostGIS
Allow NULL is checked; Editable
Minimum value: 2018; Maximum value: 2099; Step: 1

Problem:
In the form a NULL value is wrongly displayed as (Minimum value)-1 (i.e 2017) if "Representation for NULL values" in options was left empty (my preferred Setting). However, the value in the database is correct (NULL).

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• range_widget_display.jpg (Manuel K)
• range_widget_config.jpg (Manuel K)
• representation_for_NULL_values_empty.jpg (Manuel K)

[qgib]

Author Name: Anónimo (Anónimo)

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Applied in changeset f3682be.

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

[qgib]

Author Name: Manuel K (Manuel K)

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The described bug persists (master 3.3.0-71 and nightly 3.2.3-1).
And not only for attributes of type integer, but also for attributes of type numeric.

Example (type numeric):

Range widget configuration: Minimum: 0.00; Maximum: 399.90; Step: 0.10; Precision: 1; Allow NULL is checked.
--> In the form the NULL value is displayed as -0.1 (what corresponds to "[Minimum]-10^-[Precision]") instead of an empty field.

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• 13303 was configured as representation_for_NULL_values_empty.jpg
• status_id was changed from Closed to Reopened
• 13302 was configured as range_widget_config.jpg
• 13301 was configured as range_widget_display.jpg

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• representation_for_NULL_values_empty.jpg (Manuel K)
• range_widget_config.jpg (Manuel K)
• range_widget_display.jpg (Manuel K)

[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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• assigned_to_id was configured as Alessandro Pasotti

[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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PR #7943

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• status_id was changed from Reopened to In Progress
• pull_request_patch_supplied was changed from 0 to 1

[qgib]

Author Name: Anónimo (Anónimo)

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Applied in changeset d179635.

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• status_id was changed from In Progress to Closed