[QGIS-Developer] Adding Map layer to current project destroy custom layer variables in Qgis3

[David Marteau]

Just found out that this is not addMapLayer that remove the variables but 'layer.loadNamedStyle'

Print layer.customProperty('variableNames') just before calling 'layer.loadNamedStyle' show variables
Print layer.customProperty('variableNames') just after the call :  empty list

Reproduced in the python console:

>>> QgsExpressionContextUtils.setLayerVariable(layer,'FOO','BAR')
>>> layer.customProperty('variableNames')
['FOO']
>>> layer.loadNamedStyle('mystyle.qml')
('', True)
>>> layer.customProperty('variableNames')
[]


> Le 20 juin 2018 à 18:13, David Marteau <dmarteau at 3liz.com> a écrit :
> 
> Hi
> 
> I'm trying to set custom layers variables from processing using  QgsExpressionContextUtils.setLayerVariables to destination layers , I have found that those variables does not appear in 
> Qgis. 
> 
> I have found that when the layer is inserted in the current project (https://github.com/qgis/QGIS/blob/master/python/plugins/processing/gui/Postprocessing.py#L81 <https://github.com/qgis/QGIS/blob/master/python/plugins/processing/gui/Postprocessing.py#L81>) the layer variables are removed - Checking existence of the variable before
> and after the call of 'addMaperLayer' shows that layer variables are removed from custom properties.
> 
> I cannot tell if this is a bug or not because it seems that the removal may occurs in some signal handler. So if somebody has some clues to where to look, I will be grateful.
> 
> 
> Qgis version: 3.0.3-Girona
> 
> David

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