fix lexing inline sequences/mappings with trailing whitespaces

Author: xabbuh

Parser.php

@@ -741,11 +741,11 @@ private function parseValue(string $value, int $flags, string $context)
 
         try {
             if ('' !== $value && '{' === $value[0]) {
-                $cursor = \strlen($this->currentLine) - \strlen($value);
+                $cursor = \strlen(rtrim($this->currentLine)) - \strlen(rtrim($value));
 
                 return Inline::parse($this->lexInlineMapping($cursor), $flags, $this->refs);
             } elseif ('' !== $value && '[' === $value[0]) {
-                $cursor = \strlen($this->currentLine) - \strlen($value);
+                $cursor = \strlen(rtrim($this->currentLine)) - \strlen(rtrim($value));
 
                 return Inline::parse($this->lexInlineSequence($cursor), $flags, $this->refs);
             }

Tests/ParserTest.php

@@ -2683,7 +2683,7 @@ public function testMultipleWhitespaceAtEndOfLine()
             $this->parser->parse($yaml)
         );
 
-        $yaml = "\nfoo:\n    bar: {}\n";
+        $yaml = "\nfoo:\n    bar: {} \n";
         $this->assertSame(
             [
                 'foo' => [