Merge branch '3.4' into 4.3

* 3.4:
  Update GitHub PR template
  don't dump a scalar tag value on its own line

Author: nicolas-grekas

Dumper.php

@@ -80,15 +80,11 @@ public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0):
                 if ($value instanceof TaggedValue) {
                     $output .= sprintf('%s%s !%s', $prefix, $dumpAsMap ? Inline::dump($key, $flags).':' : '-', $value->getTag());
 
-                    if ($inline - 1 <= 0) {
+                    if ($inline - 1 <= 0 || null === $value->getValue() || is_scalar($value->getValue())) {
                         $output .= ' '.$this->dump($value->getValue(), $inline - 1, 0, $flags)."\n";
                     } 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;

Tests/DumperTest.php

@@ -466,10 +466,21 @@ public function testDumpingNotInlinedScalarTaggedValue()
             'user2' => new TaggedValue('user', 'john'),
         ];
         $expected = <<<YAML
-user1: !user
-    jane
-user2: !user
-    john
+user1: !user jane
+user2: !user john
+
+YAML;
+
+        $this->assertSame($expected, $this->dumper->dump($data, 2));
+    }
+
+    public function testDumpingNotInlinedNullTaggedValue()
+    {
+        $data = [
+            'foo' => new TaggedValue('bar', null),
+        ];
+        $expected = <<<YAML
+foo: !bar null
 
 YAML;