[JENKINS-74990] Prevent stack overflow / Revert 'Add icons for search' (#451)

Author: dwnusbaum

src/main/java/com/cloudbees/hudson/plugins/folder/AbstractFolder.java

@@ -101,7 +101,6 @@
 import jenkins.model.ProjectNamingStrategy;
 import jenkins.model.TransientActionFactory;
 import net.sf.json.JSONObject;
-import org.jenkins.ui.icon.IconSpec;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.Beta;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
@@ -135,7 +134,7 @@
  */
 @SuppressWarnings({"unchecked", "rawtypes"}) // mistakes in various places
 @SuppressFBWarnings("DMI_RANDOM_USED_ONLY_ONCE") // https://github.com/spotbugs/spotbugs/issues/1539
-public abstract class AbstractFolder<I extends TopLevelItem> extends AbstractItem implements TopLevelItem, ItemGroup<I>, ModifiableViewGroup, StaplerFallback, ModelObjectWithChildren, StaplerOverridable, IconSpec {
+public abstract class AbstractFolder<I extends TopLevelItem> extends AbstractItem implements TopLevelItem, ItemGroup<I>, ModifiableViewGroup, StaplerFallback, ModelObjectWithChildren, StaplerOverridable {
 
     /**
      * Our logger.
@@ -306,11 +305,6 @@ protected AbstractFolderViewHolder newFolderViewHolder() {
         return new DefaultFolderViewHolder(views, null, newDefaultViewsTabBar());
     }
 
-    @Override
-    public String getIconClassName() {
-        return icon.getIconClassName();
-    }
-
     protected FolderIcon newDefaultFolderIcon() {
         return new StockFolderIcon();
     }