bug #33377 [Yaml] fix dumping not inlined scalar tag values (xabbuh)

This PR was merged into the 3.4 branch.

Discussion
----------

[Yaml] fix dumping not inlined scalar tag values

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #33354
| License       | MIT
| Doc PR        |

Commits
-------

390f4f4329 fix dumping not inlined scalar tag values

src/Symfony/Component/Yaml/Dumper.php

@@ -120,6 +120,10 @@ class Dumper
                     } else {
                         $output .= "\n";
                         $output .= $this->dump($value->getValue(), $inline - 1, $dumpAsMap ? $indent + $this->indentation : $indent + 2, $flags);
+
+                        if (is_scalar($value->getValue())) {
+                            $output .= "\n";
+                        }
                     }
 
                     continue;

src/Symfony/Component/Yaml/Tests/DumperTest.php

@@ -525,6 +525,23 @@ YAML;
         $this->assertSame($expected, $yaml);
     }
 
+    public function testDumpingNotInlinedScalarTaggedValue()
+    {
+        $data = [
+            'user1' => new TaggedValue('user', 'jane'),
+            'user2' => new TaggedValue('user', 'john'),
+        ];
+        $expected = <<<YAML
+user1: !user
+    jane
+user2: !user
+    john
+
+YAML;
+
+        $this->assertSame($expected, $this->dumper->dump($data, 2));
+    }
+
     public function testDumpMultiLineStringAsScalarBlock()
     {
         $data = [