Symbols: symbol.instance.setAppearance refuses a fill or stroke an object does not draw

Squashed from #6232 onto main.

crates/effects/src/lib.rs

@@ -80,8 +80,8 @@ pub use marks::{CROP_MARKS, crop_marks_art, has_crop_marks};
 pub use pixel::{PIXEL_EFFECTS, PixelFx, PixelSpace};
 pub use raster::{RASTERIZE, RasterFx, Rasterize, color_param, outset, raster_effects};
 pub use reshape::{
-    SYMBOL_ART_MAX_NODES, expand_outlined, has_gradient_copies, has_item_geometry, has_transform_art, has_transform_copies, has_transform_options,
-    image_paint, needs_outline, outline_art, outline_text, reshape,
+    SYMBOL_ART_MAX_NODES, expand_outlined, gives_image_shape, has_gradient_copies, has_item_geometry, has_transform_art, has_transform_copies,
+    has_transform_options, image_paint, needs_outline, outline_art, outline_text, reshape,
 };
 pub use revolve::{REVOLVE, has_revolve, revolve_art, revolve_options, validate_revolve};
 pub use solids::{

crates/effects/src/reshape.rs

@@ -133,7 +133,13 @@ fn gives_shape(e: &Effect) -> bool {
 /// Does `item`, a fill or stroke of an image, paint something: does it paint and carry an effect
 /// that gives it a shape ([`gives_shape`])?
 fn shapes_image(item: &AppearanceItem) -> bool {
-    crate::paints(item) && item.effects().iter().any(gives_shape)
+    crate::paints(item) && gives_image_shape(item.effects())
+}
+
+/// Do `effects`, those of an image's fill or stroke, give that fill or stroke a shape to paint
+/// ([`gives_shape`])?
+pub fn gives_image_shape(effects: &[Effect]) -> bool {
+    effects.iter().any(gives_shape)
 }
 
 /// The fills and strokes of `items` (an image's own) that paint something ([`shapes_image`]), each