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After @Nyalldawson suggestion [1], we've implemented a Processing plugin
that exposes a GRASS Addon [2]. In order to do this we had to subclass
`Grass7AlgorithmProvider` and override `createAlgsList()`.
`createAlgsList()` had to be overriden in order to change the
"description folder" location.
Nyall wrote:
> And if you do it right (and only import existing
> processing grass code, minimising the copy/paste of this code), then
> your provider will automatically inherit any future fixes and
> features added to the main grass provider.
With this commit we convert the `descriptionFolder` to a class attribute
and in this way, subclasses of `Grass7AlgorithmProvider` will no longer
have to override `createAlgsList()` and will be able to continue inheriting
future enhancements.
References:
1. https://lists.osgeo.org/pipermail/qgis-developer/2019-February/056155.html
2. 948820b1c0/estimap_recreation_provider.py (L40-59)