lib/svg/path: swap out large if-else for switch

lib/svg/path.dart

@@ -572,9 +572,12 @@ class Path extends ListBase<SvgPath> {
         parts.add("M ${coord(segment.start)}");
       }
 
-      if (segment is Line) {
+      switch (segment) {
+        case Line _:
           parts.add("L ${coord(segment.end)}");
-      } else if (segment is CubicBezier) {
+          break;
+
+        case CubicBezier _:
           if (segment.isSmoothFrom(previousSegment)) {
             parts.add("S ${coord(segment.control2)} ${coord(segment.end)}");
           } else {
@@ -582,17 +585,22 @@ class Path extends ListBase<SvgPath> {
               "C ${coord(segment.control1)} ${coord(segment.control2)} ${coord(segment.end)}",
             );
           }
-      } else if (segment is QuadraticBezier) {
+          break;
+
+        case QuadraticBezier _:
           if (segment.isSmoothFrom(previousSegment)) {
             parts.add("T ${coord(segment.end)}");
           } else {
             parts.add("Q ${coord(segment.control)} ${coord(segment.end)}");
           }
-      } else if (segment is Arc) {
+          break;
+
+        case Arc _:
           parts.add(
             "A ${coord(segment.radius)} ${formatNumber(segment.rotation)} "
             "${segment.arc ? 1 : 0},${segment.sweep ? 1 : 0} ${coord(segment.end)}",
           );
+          break;
       }
 
       currentPos = segment.end;