Fix for TCK test ResolverHookTests.testBeginTriggers

The PR #95 changed some of the logic with the triggers
that get passed to resolver hooks.  When doing a refresh
the triggers got replaced with all unresolved revisions
when the triggers were not mandatory.  That is the case
when doing a refreshBundles call. That changed what the
framework passed to resolver hooks for triggers.

This fix saves the original triggers list so that calls
to the resolver hooks use the correct list of revisioins
for the triggers.

bundles/org.eclipse.osgi/container/src/org/eclipse/osgi/container/ModuleResolver.java

@@ -167,10 +167,6 @@ private static int parseInteger(String sInteger, int defaultValue, int minValue)
 	 * merged into the moduleDatabase
 	 */
 	ModuleResolutionReport resolveDelta(Collection<ModuleRevision> triggers, boolean triggersMandatory, Collection<ModuleRevision> unresolved, Map<ModuleRevision, ModuleWiring> wiringCopy, ModuleDatabase moduleDatabase) {
-		if (!triggersMandatory) {
-			// we are just resolving all bundles optionally
-			triggers = unresolved;
-		}
 		ResolveProcess resolveProcess = new ResolveProcess(unresolved, triggers, triggersMandatory, wiringCopy, moduleDatabase);
 		return resolveProcess.resolve();
 	}
@@ -500,8 +496,9 @@ protected void doLog(int level, String msg, Throwable throwable) {
 		 * back later for other reasons.
 		 */
 		private final Collection<ModuleRevision> disabled;
-		private final Collection<ModuleRevision> triggers;
-		private final boolean triggersMandatory;
+		private final Collection<ModuleRevision> toResolve;
+		private final boolean toResolveMandatory;
+		private final Collection<ModuleRevision> triggersForHook;
 		final ModuleDatabase moduleDatabase;
 		final Map<ModuleRevision, ModuleWiring> wirings;
 		private final Set<ModuleRevision> previouslyResolved;
@@ -528,8 +525,14 @@ protected void doLog(int level, String msg, Throwable throwable) {
 		ResolveProcess(Collection<ModuleRevision> unresolved, Collection<ModuleRevision> triggers, boolean triggersMandatory, Map<ModuleRevision, ModuleWiring> wirings, ModuleDatabase moduleDatabase) {
 			this.unresolved = unresolved;
 			this.disabled = new HashSet<>(unresolved);
-			this.triggers = new ArrayList<>(triggers);
-			this.triggersMandatory = triggersMandatory;
+			if (!triggersMandatory) {
+				// we are just resolving all bundles optionally
+				this.toResolve = new ArrayList<>(unresolved);
+			} else {
+				this.toResolve = new ArrayList<>(triggers);
+			}
+			this.triggersForHook = Collections.unmodifiableList(new ArrayList<>(triggers));
+			this.toResolveMandatory = triggersMandatory;
 			this.wirings = new HashMap<>(wirings);
 			this.previouslyResolved = new HashSet<>(wirings.keySet());
 			this.moduleDatabase = moduleDatabase;
@@ -540,9 +543,10 @@ protected void doLog(int level, String msg, Throwable throwable) {
 			this.unresolved = unresolved;
 			this.disabled = new HashSet<>(unresolved);
 			ModuleRevision revision = dynamicReq.getRevision();
-			this.triggers = new ArrayList<>(1);
-			this.triggers.add(revision);
-			this.triggersMandatory = false;
+			this.toResolve = new ArrayList<>(1);
+			this.toResolve.add(revision);
+			this.toResolveMandatory = false;
+			this.triggersForHook = Collections.singletonList(revision);
 			this.wirings = wirings;
 			this.previouslyResolved = new HashSet<>(wirings.keySet());
 			this.moduleDatabase = moduleDatabase;
@@ -859,7 +863,8 @@ ModuleResolutionReport resolve() {
 			threadResolving.set(Boolean.TRUE);
 			try {
 				try {
-					hook = adaptor.getResolverHookFactory().begin(InternalUtils.asList((List<? extends BundleRevision>) triggers));
+					hook = adaptor.getResolverHookFactory()
+							.begin(InternalUtils.asList((List<? extends BundleRevision>) triggersForHook));
 				} catch (RuntimeException e) {
 					if (e.getCause() instanceof BundleException) {
 						BundleException be = (BundleException) e.getCause();
@@ -877,7 +882,7 @@ ModuleResolutionReport resolve() {
 					filterResolvable();
 					selectSingletons();
 					// remove disabled from triggers to prevent the resolver from resolving them
-					if (triggers.removeAll(disabled) && triggersMandatory) {
+					if (toResolve.removeAll(disabled) && toResolveMandatory) {
 						throw new ResolutionException(Msg.ModuleResolver_SingletonDisabledError + disabled);
 					}
 					if (dynamicReq != null) {
@@ -890,11 +895,11 @@ ModuleResolutionReport resolve() {
 							// be sure to remove the revisions from the optional and triggers
 							// so they no longer attempt to be resolved
 							Set<Resource> fragmentResources = dynamicAttachWirings.keySet();
-							triggers.removeAll(fragmentResources);
+							toResolve.removeAll(fragmentResources);
 
 							result.putAll(dynamicAttachWirings);
 						}
-						resolveRevisionsInBatch(triggers, triggersMandatory, logger, result);
+						resolveRevisionsInBatch(toResolve, toResolveMandatory, logger, result);
 					}
 				} catch (ResolutionException e) {
 					re = e;