fix: JS should modify data in redirected space, not key space

Fixes deephaven#6084

web/client-api/src/main/java/io/deephaven/web/client/api/barrage/data/WebBarrageSubscription.java

@@ -366,7 +366,19 @@ public void applyUpdates(WebBarrageMessage message) {
 
  modifiedColumnSet.set(ii);
 
- PrimitiveIterator.OfLong destIterator = column.rowsModified.indexIterator();
+ PrimitiveIterator.OfLong destIterator = new PrimitiveIterator.OfLong() {
+ private final PrimitiveIterator.OfLong wrapped = column.rowsModified.indexIterator();
+
+ @Override
+ public long nextLong() {
+ return redirectedIndexes.get(wrapped.next());
+ }
+
+ @Override
+ public boolean hasNext() {
+ return wrapped.hasNext();
+ }
+ };
  for (int j = 0; j < column.data.size(); j++) {
  Chunk<Values> chunk = column.data.get(j);
  destSources[ii].fillChunk(chunk, destIterator);