loadNamedStyle fail to load edit widget

[qgib]

Author Name: Peter Petrik (@PeterPetrik)
Original Redmine Issue: 14153
Affected QGIS version: master
Redmine category:edit_widget

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This code correctly loads style from qml file and adds layer 'test' to the map canvas (see attached zip file).
The QML file defines edit widget for attribute called 'attr' with the 'value map' type (see attached screenshot):

vl = QgsVectorLayer('test.shp', 'test', 'ogr')
QgsMapLayerRegistry.instance().addMapLayer(vl)
vl.loadNamedStyle('style.qml')

But this code doesn't load correct edit widget, just shows default 'Text Edit' edit widget

vl = QgsVectorLayer('test.shp', 'test', 'ogr')
vl.loadNamedStyle('style.qml')
QgsMapLayerRegistry.instance().addMapLayer(vl)

Note: both codes correctly load renderer style

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• edit_bug.zip (Peter Petrik)
• edit_value_map.png (Peter Petrik)

[qgib]

Author Name: Sebastian Dietrich (Sebastian Dietrich)

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Widgets are loaded separately from the layers by "@QgsEditorWidgetRegistry@":http://qgis.org/api/classQgsEditorWidgetRegistry.html. It watches the layers that are known to it and when a layer is loading a new style, @QgsEditorWidgetRegistry@ loads the widgets for that layer.
Unfortunately @QgsEditorWidgetRegistry@ only knows of the layers that are added to "@QgsMapLayerRegistry@":http://qgis.org/api/classQgsMapLayerRegistry.html. So the effect is as you describe: loading QML after adding the layer works, loading QML before adding the layer does not.

The solution could be to simply make all (vector-)layers known to @QgsEditorWidgetRegistry@. But that might have other, probably unwanted, effects. I can't tell.

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• version was changed from 2.10.1 to master

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• easy_fix was configured as 0
• regression was configured as 0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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End of life notice: QGIS 2.18 LTR

Source:
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

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• resolution was changed from to end of life
• status_id was changed from Open to Closed