Show threads involved in disposing of components

Currently we show where the component was disposed but not by what
thread. As this can be interesting for debugging the cause, this
information is now added.

apitools/org.eclipse.pde.api.tools/src/org/eclipse/pde/api/tools/internal/model/BundleComponent.java

@@ -197,7 +197,8 @@ public void dispose() {
 			synchronized (this) {
 				fManifest = null;
 				fBundleDescription = null;
-				disposeSource = new RuntimeException("Component was disposed here"); //$NON-NLS-1$
+				String message = String.format("Component was disposed here [%s]", Thread.currentThread().getName()); //$NON-NLS-1$
+				disposeSource = new RuntimeException(message);
 			}
 		}
 	}
@@ -1199,6 +1200,8 @@ public ResolverError[] getErrors() throws CoreException {
 	 */
 	protected void baselineDisposed(IApiBaseline baseline) throws CoreException {
 		throw new CoreException(new Status(IStatus.ERROR, ApiPlugin.PLUGIN_ID, ApiPlugin.REPORT_BASELINE_IS_DISPOSED,
-				NLS.bind(Messages.BundleApiComponent_baseline_disposed, getName(), baseline.getName()), disposeSource));
+				NLS.bind(Messages.BundleApiComponent_baseline_disposed,
+						new Object[] { getName(), baseline.getName(), Thread.currentThread().getName() }),
+				disposeSource));
 	}
 }

apitools/org.eclipse.pde.api.tools/src/org/eclipse/pde/api/tools/internal/model/Messages.properties

@@ -16,7 +16,7 @@ ApiType_1=Unable to resolve superclass {0} for {1}
 ApiType_2=Unsupported operation - API component required for resolution
 ApiType_3=Unable to resolve member type {0} for {1}
 ApiScope_0=Unable to visit this element type: {0}
-BundleApiComponent_baseline_disposed=Component ''{0}'' in the baseline ''{1}'' is disposed
+BundleApiComponent_baseline_disposed=Component ''{0}'' in the baseline ''{1}'' is disposed [{2}]
 BundleComponent_failed_to_lookup_fragment=Failed to look up resolved fragment: {0}
 configuring_baseline=Configuring baseline
 resolving_target_definition=resolving target definition...