Fix state exit with fork

- Fix a case where state leading into a fork
  doesn't exit.
- Relates to work in #221

spring-statemachine-build-tests/src/test/java/org/springframework/statemachine/buildtests/ForkJoinEntryExitTests.java

@@ -81,6 +81,8 @@ public class ForkJoinEntryExitTests extends AbstractBuildTests {
 					.step().expectState("S1").and()
 					.step()
 						.sendEvent("E1")
+						.expectStateEntered(3)
+						.expectStateExited(1)
 						.expectStates("S2", "S210", "S220").and()
 					.step()
 						.sendEvent("E2")
@@ -109,8 +111,10 @@ public class ForkJoinEntryExitTests extends AbstractBuildTests {
 					.step().expectState("S1").and()
 					.step()
 						.sendEvent("E1")
+						.expectStateEntered(3)
+						.expectStateExited(1)
 						.expectStates("S2", "S210", "S220").and()
-						.step()
+					.step()
 						.sendEvent("E2")
 						.expectStateEntered(1)
 						.expectStateExited(1)

spring-statemachine-core/src/main/java/org/springframework/statemachine/support/AbstractStateMachine.java

@@ -733,6 +733,7 @@ public abstract class AbstractStateMachine<S, E> extends StateMachineObjectSuppo
 		// need to check for from original state passed in
 		kind = toState.getPseudoState() != null ? toState.getPseudoState().getKind() : null;
 		if (kind == PseudoStateKind.FORK) {
+			exitCurrentState(toState, message, transition, stateMachine);
 			ForkPseudoState<S, E> fps = (ForkPseudoState<S, E>) toState.getPseudoState();
 			for (State<S, E> ss : fps.getForks()) {
 				callPreStateChangeInterceptors(ss, message, transition, stateMachine);