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* Treat a first intersect mask component as its base selection A mask created with Intersect as its first component currently renders as empty, so the overlay and local adjustments never appear. Using that component as the base matches how Add and Subtract first components already behave. Change evaluate_one so the first component always sets the base alpha regardless of its combine op. Add a regression test with a single Intersect linear-gradient component asserting the start side is selected. Test: intersect_first_component_selects_its_shape failed before the change and passes after. * Masks: the GPU treats a first Intersect as the base too, and the process doc says so Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Docs: what changes for masks that start with Intersect Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: eliets2 <287273517+eliets2@users.noreply.github.com> Co-authored-by: FredApps <153173854+FredApps@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>