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The canvas clips a clip group by its clipping path with the path's live geometry effects applied, but clicks, hovers and marquees still tested the plain clipping path. A click where a Transform effect had moved the clip selected nothing, and a click on the clipping path's own place selected art that was not drawn there. - The engine registers the effect-shaped region with the doc crate (`hit::set_clip_region`), as it does for image paint and live art. It gives a region only when the clipping path holds a visible geometry effect; otherwise clicks keep the plain shapes, and type keeps counting by its frame. - Clicks, `objects_at`, the hidden art of a selected object, the Unlock submenu's list and marquees inside a clip group or a clipping layer use that region. Outline view and layers with Preview off draw no effects and keep the plain shapes; the Selection, Direct Selection and Enclosing Lasso marquees pass the view's outline state (`hit::marquee_in_view`). Each container around a selected object tests its clipping path in the outline state a click has there. - A marquee touches the clipping path itself by its own geometry, as a click on its outline finds it, and also on the edge of the region, so a marquee around a clipping path that an effect moved into large art still selects it. `hit::marquee_in` keeps the plain shapes for the Color Theme Picker, which clips by them. - The region is kept per thread until the clipping path or the live inputs change. A clip group's reach takes in the region's box, so culling does not skip art the region moved past the plain clipping path. Up to 4096 boxes are kept; when they are full, a new box replaces only as many others as it needs room for. Docs: docs/target-app-parity.md.