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bd1d87ed86
execution on generated layers after the algorithm (or parent model) completes This commit adds an interface for layer post-processing handlers for execution following a processing algorithm operation. Post-processing of a layer will ONLY occur if that layer is set to be loaded into a QGIS project on algorithm completion. Algorithms that wish to set post-processing steps for generated layers should implement this interface in a separate class (NOT the algorithm class itself!) and implement a method to handle the layer post-processing. This method always runs in the main thread and can be used to setup renderers, editor widgets, metadata, etc for the given layer. Fixes #17961