[twisty] Ignore comments and newlines when determining simultaneous m…

…oves.

Allows the following to work: https://alpha.twizzle.net/edit/?alg=%28R+%2F%2F+this+is+a+comment%0A%2F%2F+hi+there%0AL%29

src/cubing/twisty/controllers/indexer/simultaneous-moves/simul-move.spec.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "bun:test";
+import { Alg } from "../../../../alg";
+import { simulMoves } from "./simul-moves";
+
+test("can be modified", () => {
+  const leavesWithRanges = simulMoves(
+    new Alg(`(R // this is a comment
+// this too
+L)`),
+  );
+  expect(leavesWithRanges.length).toEqual(2);
+  expect(leavesWithRanges[0].end).toEqual(1000);
+  expect(leavesWithRanges[1].end).toEqual(1000);
+});

src/cubing/twisty/controllers/indexer/simultaneous-moves/simul-moves.ts

@@ -1,13 +1,13 @@
 import {
+  LineComment,
   Move,
+  Newline,
   TraversalUp,
   functionFromTraversal,
   type Alg,
   type Commutator,
   type Conjugate,
   type Grouping,
-  type LineComment,
-  type Newline,
   type Pause,
 } from "../../../../alg";
 import type { MillisecondTimestamp } from "../../AnimationTypes";
@@ -64,14 +64,20 @@ export class LocalSimulMoves extends TraversalUp<LocalAnimLeavesWithRange[]> {
       return [];
     }
 
+    const moves: Move[] = [];
     for (const algNode of alg.childAlgNodes()) {
-      if (!algNode.is(Move)) {
+      if (
+        !(algNode.is(Move) || algNode.is(LineComment) || algNode.is(Newline))
+      ) {
         // TODO: define the type statically on the class?
         return this.traverseAlg(alg);
       }
+      const asMove = algNode.as(Move);
+      if (asMove) {
+        moves.push(asMove);
+      }
     }
 
-    const moves = Array.from(alg.childAlgNodes()) as Move[];
     let maxSimulDur = defaultDurationForAmount(moves[0].amount);
     for (let i = 0; i < moves.length - 1; i++) {
       for (let j = 1; j < moves.length; j++) {