Will add child items of related items to publishing queue if they are contained in a specified "shared content" location

AddItemLinkReferencesWithSharedContent.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <pipelines>
          
      <getItemReferences>
        <!-- Returns children of linked references if they are contained in a location specified in the SharedContentLocations setting -->
        <processor type="MyProject.AddItemLinkReferencesWithSharedContent, MyProject"/>
      </getItemReferences>
    
    </pipelines>
    
    <settings>
      <!-- Pipe separated list of shared content locations -->
      <setting name="MyProject.SharedContentLocations" value="/sitecore/content/test/SharedContent" />
    </settings>
  </sitecore>
</configuration>

AddItemLinkReferencesWithSharedContent.cs

/// <summary>
/// Returns all link references from AddItemLinkReferences plus child items of links if the are contained in a specific shared content location 
/// </summary>
public class AddItemLinkReferencesWithSharedContent : AddItemLinkReferences
{
    protected override List<Item> GetItemReferences(PublishItemContext context)
    {
        Assert.ArgumentNotNull((object)context, "context");
        List<Item> relatedItems = base.GetItemReferences(context);
        List<Item> relatedItemChildren = new List<Item>();

        var sharedContentLocations = Settings.GetSetting("MyProject.SharedContentLocations", string.Empty).Split('|');
        
        // Add children of each referenced item in shared content
        foreach (var item in relatedItems.Where(i => sharedContentLocations.Any(l => IsContainedInSharedContent(i, l))))
        {
            if (item.HasChildren)
            {
                relatedItemChildren.AddRange(item.Children);
            }
        }

        return relatedItemChildren;
    }

    // Returns true if the specified item is a descendant of the specified path.
    private bool IsContainedInSharedContent(Item item, string path)
    {
        return item.Paths.FullPath.StartsWith(path, StringComparison.InvariantCultureIgnoreCase) && !item.Paths.FullPath.Equals(path, StringComparison.CurrentCultureIgnoreCase);
    }
}