Bug 63267 [RCP] tab style for M9
the tab style in the IDE in M9 should use the curved style
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
* The feature set excludes features that do not have their own
	 * feature plug-in.
	 * 
	 * @return set of versioned feature ids (element type: <code>String</code>)
	 * @since 3.0
	 */
	private Set computeFeatureSet() {
		IPlatformConfiguration platformConfiguration = BootLoader.getCurrentPlatformConfiguration();
		IPlatformConfiguration.IFeatureEntry[] features = platformConfiguration.getConfiguredFeatureEntries();
		Set ids = new HashSet(features.length);
		for (int i = 0; i < features.length; i++) {
			IPlatformConfiguration.IFeatureEntry feature = features[i];
			
			String pluginId = feature.getFeaturePluginIdentifier();
			if (pluginId == null) {
				continue;
			}
			String id = feature.getFeatureIdentifier();
			String version = feature.getFeatureVersion();
			String normalizedVersion = "0.0.0"; 
			if (version != null) {
				
				PluginVersionIdentifier vid = new PluginVersionIdentifier(version);
				normalizedVersion = vid.toString();
			}
			String versionedId = id + ":" + normalizedVersion; 
			ids.add(versionedId);
		}
		return ids;
	}