Merge pull request #7501 from dotCooCoo/fix/export-bakes-symbol-art-effects

Export: live effects in symbol art apply in PDF, EPS, print and DXF

docs/target-app-parity.md

@@ -1609,6 +1609,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
     Outline Object on an image's own fill or stroke follows the outline of the image's opaque area, and the image's frame when the image has no transparency. Path effects apply to a fill or stroke added to a bitmap object ([archived reference manual, page 561](https://web.archive.org/web/20210601162814/https://helpx.adobe.com/pdf/illustrator_reference.pdf#page=561)), and with Outline Object such a stroke follows the boundary of the art when the image has transparent areas and the image's frame when it has none ([CreativePro article on strokes for placed images](https://web.archive.org/web/20250815214529/https://creativepro.com/add-strokes-placed-images-illustrator/)). VectorCraft's own rules: the opaque area is the pixels at least 50% opaque, and its outline is traced as Image Trace's Black and White mode traces at threshold 128 and fitted with curves. Evidence: `tests::imageoutline` (vectorcraft-effects), `opaque::tests` (vectorcraft-trace), `tests::containers::an_images_stroke_with_outline_object_follows_its_opaque_area` and `tests::containers::an_images_outline_object_stroke_exports_selects_and_measures_along_its_opaque_area` (vectorcraft-engine), `tests::objectfx::an_images_outline_object_stroke_follows_new_pixels_under_the_same_key` (vectorcraft-render).
     A geometry effect on one of type's own fills or strokes reshapes the whole outline that the fill or stroke paints, on the canvas and in exports; PDF, SVG, EPS and the other vector exports write such type as paths. On type that holds inline graphics, those effects are drawn and exported only when the type has a geometry effect or perspective of its own.
     A geometry effect on a symbol instance's fill reshapes the filled shapes of the symbol's art and leaves their strokes as they are; one on the instance's stroke reshapes the stroked shapes and leaves their fills as they are. The shapes keep their colors. Only the instance's topmost fill and topmost stroke count, and only while they are visible with an opacity above 0. The canvas and Object › Expand Appearance use the same art, SVG and PDF export bake the same shapes, and Expand Appearance turns the instance into an editable group in one undo step. A group's own fills and strokes in the art take the effects too. An instance inside the art passes the effects on to its own art, and a dynamic symbol's instance reshapes the fills and strokes it paints on the art. How the effects map onto the symbol's art is VectorCraft's own rule. The help page <https://helpx.adobe.com/illustrator/desktop/special-effects-styles/apply-filter-effects/apply-and-modify-effects.html> describes effects on one fill or stroke, and the help page <https://helpx.adobe.com/illustrator/desktop/manage-objects/arrange-objects/expand-objects.html> describes Expand Appearance (engine `expand::a_symbol_instance_fill_effect_reshapes_its_filled_art_and_expands`, `a_symbol_instance_stroke_effect_reshapes_its_stroked_art_and_expands`, `a_stroke_effect_reshapes_a_stroke_a_dynamic_instance_adds`, `a_fill_effect_reshapes_the_fill_of_a_group_in_the_art`, `only_the_topmost_visible_instance_fill_reshapes_the_art`, `a_nested_symbol_instance_takes_the_outer_fill_effect`, `export_bakes_a_symbol_instance_fill_effect`, `a_fill_effect_on_an_instance_of_a_symbol_that_holds_itself_ends`). Existing documents with a geometry effect on a symbol instance's fill or stroke draw differently: before, the effect drew nothing.
+    Live effects inside a symbol's art (geometry effects, color adjustments and the rest that export bakes) are written where each instance places the art in PDF, print, EPS and DXF, as the canvas draws them: the art is placed first and its effects are applied after, so an instance that scales its art does not scale the distance a Transform effect moves it. Symbols nested in the art, a dynamic symbol instance's own paint changes and the stain an instance's fill gives its art are kept, and the art is stained before its effects apply. A linked instance's PDF link covers its art where the effects draw it. A symbol whose art holds itself stops at the nesting limit, and the symbols' own art keeps its effects. An instance stays an instance in these exports when the objects its art makes once baked (the copies a Transform effect makes included) would take the export's placed symbol art past 16,000,000 objects, or when its baked art would draw deeper than the 128 levels a document may draw; these are VectorCraft's own limits. Art baked for an instance that then stays an instance still counts toward that limit, and while an instance's art bakes, the art's own objects are held in the limit for the instances nested in it. Instances the export leaves out (hidden ones, those in hidden groups, on template layers, and on hidden layers or layers that do not print when the export leaves those out) are not placed and do not count toward that limit. Before, these exports wrote the art without its effects (effects `bake::placing_symbols_bakes_their_art_where_each_instance_places_it`, `placing_symbols_reaches_the_art_of_nested_instances`, `placing_a_symbol_that_holds_itself_stops`, `placing_symbols_keeps_dynamic_instances_changes`, `placing_symbols_keeps_the_instances_stain`, `placing_symbols_counts_the_baked_art`, `placing_symbols_counts_nested_art_once`, `placing_symbols_holds_the_outer_art_while_it_bakes`, `placing_symbols_counts_the_art_it_drops`, `placing_symbols_counts_art_dropped_for_depth_against_later_baked_art`, `placing_symbols_keeps_the_baked_art_within_the_drawn_depth`, `placing_symbols_skips_instances_the_export_leaves_out`; doc `depth::tests::drawn_heights_measure_objects_outside_the_layers`; PDF, print, EPS and DXF `symbol_art_effects_are_written_where_they_draw`, `symbol_art_effects_print_where_they_draw`; PDF `a_stained_instance_keeps_its_stain_when_its_art_has_effects`, `a_linked_instance_keeps_its_link_when_its_art_has_effects`).
     A raster effect (Drop Shadow, Outer Glow, Gaussian Blur and the other effects that paint pixels) on a symbol instance's topmost fill draws on each filled shape of the symbol's art, and one on its topmost stroke draws on each stroked shape, after any geometry effects listed before it, under the same rules as geometry effects: only a visible fill or stroke with an opacity above 0 counts, a group's own fills and strokes in the art take the effect, and an instance inside the art passes it on. Each shape gets its own shadow or glow, which is VectorCraft's own rule. The canvas, Use Preview Bounds and the drawn bounds, SVG and PDF export draw it, and Object › Expand Appearance is enabled for such an instance and makes the effect an image at the document's raster effects resolution, in one undo step (engine `expand::a_symbol_instance_fill_shadow_shadows_its_filled_art`, `a_symbol_instance_stroke_shadow_shadows_only_its_stroked_art`, `a_symbol_instance_fill_shadow_follows_the_fill_offset_before_it`, `a_nested_symbol_instance_takes_the_outer_fill_shadow`, `export_draws_a_symbol_instance_fill_shadow`). Existing documents with a raster effect on a symbol instance's fill or stroke draw differently: before, the effect drew nothing.
     The Appearance panel's inline effect editor labels each parameter as the effect dialogs' generic fields do, without the colon ("Max. Radius", "Channel 1", "Create New Fields by"). Roughen's and Zig Zag's Points, Offset Path's Joins, Inner Glow's Source and the menus of Radial Blur, Smart Blur, Sprayed Strokes, Glass, Mezzotint, Halftone Pattern, Grain, Texturizer and De-Interlace are dropdowns with the dialog's labels that send the dialog's values, and a plug-in's choice is a dropdown of the plug-in's values.
     Revolve's edge, Extrude & Bevel's bevel, every Warp style's orientation, Rasterize's Color Model, Background and Anti-aliasing and the channel of Levels and Curves are dropdowns too, with the labels their own dialogs show. `effect.apply` and `effect.setParams` refuse a Levels or Curves `channel` other than `rgb`, `red`, `green` or `blue` (or `r`, `g` and `b`, in any letter case).