Bug 261147 [CommonNavigator] Navigator label provider uses inconsistent methods to do the same thing
In NavigatorContentServiceLabelProvider some of the methods use findContentExtensionsWithPossibleChild and others use findRelevantLabelProvider. The latter is better and they should all use that one.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceLabelProvider.java
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 *     IBM Corporation - initial API and implementation
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package org.eclipse.ui.internal.navigator;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.core.commands.common.EventManager;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.jface.util.SafeRunnable;
import org.eclipse.jface.viewers.IColorProvider;
import org.eclipse.jface.viewers.IFontProvider;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITreePathLabelProvider;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.ViewerLabel;
import org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.IStyledLabelProvider;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.graphics.Color;