Preserve the current values when loading debug options in JobManager

Do not set them to false if they are not explicitly set in the
configuration, leave them as they are. This avoids the duplicated logic
of declaring them as "false" when they are declared and also when they
are loaded.

Author: fedejeanne

runtime/bundles/org.eclipse.core.jobs/src/org/eclipse/core/internal/jobs/JobManager.java

@@ -1366,14 +1366,14 @@ private long lifeTimeInMs() {
 	@Override
 	public void optionsChanged(DebugOptions options) {
 		DEBUG_TRACE = options.newDebugTrace(PI_JOBS);
-		DEBUG = options.getBooleanOption(OPTION_DEBUG_JOBS, false);
-		DEBUG_BEGIN_END = options.getBooleanOption(OPTION_DEBUG_BEGIN_END, false);
-		DEBUG_YIELDING = options.getBooleanOption(OPTION_DEBUG_YIELDING, false);
-		DEBUG_YIELDING_DETAILED = options.getBooleanOption(OPTION_DEBUG_YIELDING_DETAILED, false);
-		DEBUG_DEADLOCK = options.getBooleanOption(OPTION_DEADLOCK_ERROR, false);
-		DEBUG_LOCKS = options.getBooleanOption(OPTION_LOCKS, false);
-		DEBUG_SHUTDOWN = options.getBooleanOption(OPTION_SHUTDOWN, false);
-		DEBUG_BLOCKED_UNBLOCKED = options.getBooleanOption(OPTION_DEBUG_BLOCKED_UNBLOCKED, false);
+		DEBUG = options.getBooleanOption(OPTION_DEBUG_JOBS, DEBUG);
+		DEBUG_BEGIN_END = options.getBooleanOption(OPTION_DEBUG_BEGIN_END, DEBUG_BEGIN_END);
+		DEBUG_YIELDING = options.getBooleanOption(OPTION_DEBUG_YIELDING, DEBUG_YIELDING);
+		DEBUG_YIELDING_DETAILED = options.getBooleanOption(OPTION_DEBUG_YIELDING_DETAILED, DEBUG_YIELDING_DETAILED);
+		DEBUG_DEADLOCK = options.getBooleanOption(OPTION_DEADLOCK_ERROR, DEBUG_DEADLOCK);
+		DEBUG_LOCKS = options.getBooleanOption(OPTION_LOCKS, DEBUG_LOCKS);
+		DEBUG_SHUTDOWN = options.getBooleanOption(OPTION_SHUTDOWN, DEBUG_SHUTDOWN);
+		DEBUG_BLOCKED_UNBLOCKED = options.getBooleanOption(OPTION_DEBUG_BLOCKED_UNBLOCKED, DEBUG_BLOCKED_UNBLOCKED);
 	}
 
 	@Override