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Description
Feature description
Would it be possible to include in the legend add layer to legend box, similar to that of 'Show visible layers only', to include another checkbox that is able to further filter the legend items by those not already included in the Legend items list? e.g. if layers A, B and C are in a project and layers A and B are visible to the layout/composer, and layer A is presently in the Legend list, when you click to add a new legend item, all A, B and C would be visible in the list. If you then click 'Show visible layers only', you would see layers A and B. When you then click the filter 'Show only layers not already in legend', only layer B would be visible.
Additional context
No response