Sort layers alphabetically if sort order matches

[RobQuincey-DC]

Layers are currently sorted by their sortOrder parameter. When layers all have the same sortOrder (which is often the case when no particular order is required), they will then be ordered by the order they come in, which is pretty random.

Instead, anything with the same sortOrder should be ordered by name.

The following in LayerList.ts:127 should do the trick.

    category.layers
      .sort((a, b) => {
        if (a.sortOrder === b.sortOrder) {
          return a.name.localeCompare(b.name);
        }
        return a.sortOrder - b.sortOrder;
      })
      .forEach((layer) => {
        const listItem = this.createLayerListItem(layer);
        listContainer.appendChild(listItem);
      });