bug symfony#28322 [Workflow] Make sure we do not run the next transition on an updated state (Nyholm)

This PR was squashed before being merged into the 4.1 branch (closes symfony#28322).

Discussion
----------

[Workflow] Make sure we do not run the next transition on an updated state

| Q             | A
| ------------- | ---
| Branch?       | 4.1
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        |

When you have a workflow like this, where all transitions are named the same.

![php](https://user-images.githubusercontent.com/1275206/44908106-87914680-ad1a-11e8-9c6f-e58de4b255e8.png)

The current behavior on `$stateMachine->apply($object, 'next')` is that it will go to "done".

It will do this because it checks the current "froms" at each iteration in the loop in `apply()`. It should check the valid transition before it actually apply them.

Commits
-------

d9dda76 [Workflow] Make sure we do not run the next transition on an updated state

Author: fabpot

src/Symfony/Component/Workflow/Tests/WorkflowTest.php

@@ -345,6 +345,25 @@ public function testApplyWithSameNameTransition2()
         $this->assertTrue($marking->has('d'));
     }
 
+    public function testApplyWithSameNameTransition3()
+    {
+        $subject = new \stdClass();
+        $subject->marking = array('a' => 1);
+
+        $places = range('a', 'd');
+        $transitions = array();
+        $transitions[] = new Transition('t', 'a', 'b');
+        $transitions[] = new Transition('t', 'b', 'c');
+        $transitions[] = new Transition('t', 'c', 'd');
+        $definition = new Definition($places, $transitions);
+        $workflow = new Workflow($definition, new MultipleStateMarkingStore());
+
+        $marking = $workflow->apply($subject, 't');
+        // We want to make sure we do not end up in "d"
+        $this->assertTrue($marking->has('b'));
+        $this->assertFalse($marking->has('d'));
+    }
+
     public function testApplyWithEventDispatcher()
     {
         $definition = $this->createComplexWorkflowDefinition();

src/Symfony/Component/Workflow/Workflow.php

@@ -139,6 +139,7 @@ public function apply($subject, $transitionName)
 
         $transitionBlockerList = null;
         $applied = false;
+        $approvedTransitionQueue = array();
 
         foreach ($this->definition->getTransitions() as $transition) {
             if ($transition->getName() !== $transitionName) {
@@ -149,7 +150,10 @@ public function apply($subject, $transitionName)
             if (!$transitionBlockerList->isEmpty()) {
                 continue;
             }
+            $approvedTransitionQueue[] = $transition;
+        }
 
+        foreach ($approvedTransitionQueue as $transition) {
             $applied = true;
 
             $this->leave($subject, $transition, $marking);