Let UpdateBuildpathWizard request ClasspathUpdate

Currently the UpdateBuildPathWizard updates some classpath settings but
this does not mean the classpath is recomputed as values are cached.

To makes sure everything is up-to-date the UpdateClasspathJob of the
wizard now also request an classpath Update for all processed projects.

Author: laeubi

ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/wizards/tools/UpdateClasspathJob.java

@@ -14,6 +14,7 @@
  *******************************************************************************/
 package org.eclipse.pde.internal.ui.wizards.tools;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import org.eclipse.core.resources.IFile;
@@ -42,10 +43,15 @@ public static Job scheduleFor(List<IPluginModelBase> models, boolean user) {
 		WorkspaceJob job = new WorkspaceJob(PDEUIMessages.UpdateClasspathJob_title) {
 			@Override
 			public IStatus runInWorkspace(IProgressMonitor monitor) throws CoreException {
+				List<IProject> toUpdate = new ArrayList<>();
 				SubMonitor mon = SubMonitor.convert(monitor, PDEUIMessages.UpdateClasspathJob_task, models.size());
 				for (IPluginModelBase model : models) {
-					updateClasspath(model, mon.split(1));
+					IProject project = updateClasspath(model, mon.split(1));
+					if (project != null) {
+						toUpdate.add(project);
+					}
 				}
+				ClasspathComputer.requestClasspathUpdate(toUpdate);
 				return Status.OK_STATUS;
 			}
 		};
@@ -55,7 +61,7 @@ public IStatus runInWorkspace(IProgressMonitor monitor) throws CoreException {
 		return job;
 	}
 
-	private static void updateClasspath(IPluginModelBase model, SubMonitor monitor) throws CoreException {
+	private static IProject updateClasspath(IPluginModelBase model, SubMonitor monitor) throws CoreException {
 		try {
 			monitor.subTask(model.getPluginBase().getId());
 			// no reason to compile classpath for a non-Java model
@@ -70,13 +76,15 @@ private static void updateClasspath(IPluginModelBase model, SubMonitor monitor)
 						file.deleteMarkers(PDEMarkerFactory.MARKER_ID, true, IResource.DEPTH_ZERO);
 					}
 					ClasspathComputer.setClasspath(project, model);
+					return project;
 				}
 			}
 		} catch (CoreException e) {
 			String message = PDEUIMessages.UpdateClasspathJob_error_message;
 			PDEPlugin.logException(e, PDEUIMessages.UpdateClasspathJob_error_title, message);
 			throw new CoreException(Status.error(message, e));
 		}
+		return null;
 	}
 
 }