Fix curve with multiple non-closed components. (#5963)

crates/typst-layout/src/shapes.rs

@@ -284,6 +284,7 @@ impl<'a> CurveBuilder<'a> {
         self.last_point = point;
         self.last_control_from = point;
         self.is_started = true;
+        self.is_empty = true;
     }
 
     /// Add a line segment.

docs/guides/page-setup.md

@@ -56,7 +56,7 @@ requirements with examples.
 Typst's default page size is A4 paper. Depending on your region and your use
 case, you will want to change this. You can do this by using the
 [`{page}`]($page) set rule and passing it a string argument to use a common page
-size. Options include the complete ISO 216 series (e.g. `"iso-a4"`, `"iso-c2"`),
+size. Options include the complete ISO 216 series (e.g. `"a4"` and `"iso-c2"`),
 customary US formats like `"us-legal"` or `"us-letter"`, and more. Check out the
 reference for the [page's paper argument]($page.paper) to learn about all
 available options.

tests/suite/visualize/curve.typ

@@ -38,6 +38,16 @@
   curve.close(mode: "smooth"),
 )
 
+--- curve-multiple-non-closed ---
+#curve(
+  stroke: 2pt,
+  curve.line((20pt, 0pt)),
+  curve.move((0pt,  10pt)),
+  curve.line((20pt, 10pt)),
+  curve.move((0pt,  20pt)),
+  curve.line((20pt, 20pt)),
+)
+
 --- curve-line ---
 #curve(
   fill: purple,