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* Layers: run set-layer-visibility actions, keeping radio-button groups The engine can apply a set-layer-visibility action (SetOCGState, ISO 32000-2 §12.6.4.13) to a document's layers: each ON, OFF or Toggle in order, naming the layer by its optional content group, so a toggle sees the state the changes before it left. With /PreserveRB (the default), a layer turned on turns off the other layers of its radio-button groups, now read from /OCProperties /D /RBGroups; turning one off leaves them alone. The renderer is rebuilt once per action, not once per layer. Like the Layers panel, this changes the view, not the document. Tests: engine set_layer_actions_toggle_in_order_and_keep_radio_groups and set_layer_actions_change_what_renders (pixels before and after), render radio_button_layer_groups_are_read. * Links: run set-layer-visibility actions Clicking a link whose action is SetOCGState showed "SetOCGState actions run in the JavaScript engine (M6)" and did nothing. Links now read the action (/State, also when indirect, and /PreserveRB) and clicking runs it; the Layers panel follows. Hovering shows "Set layer visibility" (translated in the ja, es, zh-hans and zh-hant catalogs), and doc_info describes the action in its link list. Tests: render links_read_set_layer_actions, automation doc_info_describes_set_layer_links and ui-egui links_set_layer_visibility. * Forms: push buttons run set-layer-visibility actions A push button whose mouse-up action is SetOCGState counted as having no action, so clicking it did nothing. Buttons now read the action as links do, and clicking runs it. Tests: forms push_buttons_read_set_layer_actions and ui-egui push_buttons_set_layer_visibility. parity: edit.action-set-ocg-state is partial. The notes say what is missing: creating the action, bookmarks and other triggers, /Next chains, JavaScript ocg.state, and the Layers panel keeping radio-button groups itself. * French: Set layer visibility The French catalog is coverage-checked since #291. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Brandon Thomas <echelon@gmail.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>