Feature request #15618
Integrate isselected() expression function from ExpressionsPlus plugin in core
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The "Expressions plus" plugin contains a useful function named isselected('layername'). This would be useful for a wider user base to test a feature against the selection state, e.g. for filtering Atlas to the selected range.
It would be good if this expression function could be ported to C++ and integrated with QGIS core.