Add counter to update classpath message

When updating the classpath of the plugins, the message now includes
additional information about how many out of how many plugins have been
processed (e.g. 10/321), useful for large workspaces.

Author: fedejeanne

ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/ClasspathContainerState.java

@@ -45,6 +45,7 @@
 import org.eclipse.jdt.core.IJavaProject;
 import org.eclipse.jdt.core.JavaCore;
 import org.eclipse.jdt.core.JavaModelException;
+import org.eclipse.osgi.util.NLS;
 import org.eclipse.pde.core.plugin.IPluginModelBase;
 import org.eclipse.pde.internal.core.natures.BndProject;
 import org.eclipse.pde.internal.core.natures.PluginProject;
@@ -114,13 +115,15 @@ protected IStatus run(IProgressMonitor jobMonitor) {
 			int count = requests.size();
 			monitor.setWorkRemaining(count * 2);
 
-			for (UpdateRequest req : requests) {
+			String messageTemplate = PDECoreMessages.PluginModelManager_1 + " ({0}/{1}): {2}"; //$NON-NLS-1$
+			for (int i = 0; i < requests.size(); i++) {
+				UpdateRequest req = requests.get(i);
 				if (monitor.isCanceled()) {
 					break;
 				}
 				IProject project = req.project();
 				if (project.exists() && project.isOpen()) {
-					monitor.subTask(project.getName());
+					monitor.setTaskName(NLS.bind(messageTemplate, i + 1, count, project.getName()));
 					IPluginModelBase model = modelManager.findModel(project);
 					if (isPdeContainerProject(project, model) && PluginProject.isJavaProject(project)) {
 						IJavaProject javaProject = JavaCore.create(project);