Gradients: an outlined stroke leaves dither behind, and paint.setStroke refuses it

Review follow-up (CodeRabbit): paint.setStroke kept `dither: true` from its
gradient, and a stroke can hold dither anyway (swapped from a fill). Outline
Stroke and appearance expansion copied the stroke's paint into the outline's
fill, which then drew dithered although the stroke never did. The outline's
fill now goes without dither (Paint::stroke_as_fill), and paint.setStroke
refuses a gradient with `dither: true`, as paint.editGradient does.

crates/engine/src/cmd/paint.rs

@@ -403,6 +403,10 @@ fn set_paint(s: &mut Session, p: &Value, fill: bool) -> Result<Value> {
     }
     check_keep_model(p, cmd)?;
     let paint = paint_from(s, p)?.ok_or_else(|| bad(cmd, "give color, none, swatch or gradient"))?;
+    // As `paint.editGradient`: a `dither` given applies to gradient fills only.
+    if !fill && matches!(&paint, Paint::Gradient(g) if g.gradient.dither) && p.get("swatch").is_none() {
+        return Err(bad(cmd, "`dither` applies to gradient fills (paint.setFill)"));
+    }
     apply_paint(s, p, paint, fill)
 }
 

crates/engine/src/cmd/pathops.rs

@@ -635,7 +635,7 @@ pub(crate) fn outlined_stroke(
         blend: st.blend,
         effects: st.effects.clone(),
         overprint: st.overprint,
-        ..vectorcraft_doc::appearance::FillLayer::new(st.paint.clone())
+        ..vectorcraft_doc::appearance::FillLayer::new(st.paint.stroke_as_fill())
     };
     n.appearance = Appearance { items: vec![AppearanceItem::Fill(fill)], ..Default::default() }.into();
     Some(n)