bug symfony#25927 [Form] Fixed submitting disabled buttons (HeahDude)

This PR was merged into the 2.7 branch.

Discussion
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[Form] Fixed submitting disabled buttons

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#23759
| License       | MIT
| Doc PR        | ~

Commits
-------

804b2a1 Fixed submitting disabled buttons

Author: fabpot

src/Symfony/Component/Form/SubmitButton.php

@@ -43,6 +43,12 @@ public function isClicked()
      */
     public function submit($submittedData, $clearMissing = true)
     {
+        if ($this->getConfig()->getDisabled()) {
+            $this->clicked = false;
+
+            return $this;
+        }
+
         parent::submit($submittedData, $clearMissing);
 
         $this->clicked = null !== $submittedData;

src/Symfony/Component/Form/Tests/CompoundFormTest.php

@@ -1066,6 +1066,28 @@ public function testClickedButtonFromParentForm()
         $this->assertSame($button, $this->form->getClickedButton());
     }
 
+    public function testDisabledButtonIsNotSubmitted()
+    {
+        $button = new SubmitButtonBuilder('submit');
+        $submit = $button
+            ->setDisabled(true)
+            ->getForm();
+
+        $form = $this->createForm()
+            ->add($this->getBuilder('text')->getForm())
+            ->add($submit)
+        ;
+
+        $form->submit(array(
+            'text' => '',
+            'submit' => '',
+        ));
+
+        $this->assertTrue($submit->isDisabled());
+        $this->assertFalse($submit->isClicked());
+        $this->assertFalse($submit->isSubmitted());
+    }
+
     protected function createForm()
     {
         return $this->getBuilder()