bug #847 [TwigComponent] fixing issue with files finishing with comments (matheo)

This PR was squashed before being merged into the 2.x branch.

Discussion
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[TwigComponent] fixing issue with files finishing with comments

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tickets       | Fix #846
| License       | MIT

Commits
-------

0f8072a [TwigComponent] fixing issue with files finishing with comments

Author: weaverryan

src/TwigComponent/src/Twig/TwigPreLexer.php

@@ -46,6 +46,10 @@ public function preLexComponents(string $input, bool $insideOfBlock = false): st
                 $output .= $this->consumeUntil('#}');
                 $this->consume('#}');
                 $output .= '#}';
+
+                if ($this->position === $this->length) {
+                    break;
+                }
             }
 
             if ($this->consume('<twig:')) {

src/TwigComponent/tests/Unit/TwigPreLexerTest.php

@@ -171,5 +171,15 @@ public function getLexTests(): iterable
             '{# <twig:Alert/> #} <twig:Alert/>',
             '{# <twig:Alert/> #} {{ component(\'Alert\') }}',
         ];
+
+        yield 'file_ended_with_comments' => [
+            '{# <twig:Alert/> #}',
+            '{# <twig:Alert/> #}',
+        ];
+
+        yield 'mixing_component_and_file_ended_with_comments' => [
+            '<twig:Alert/> {# <twig:Alert/> #}',
+            '{{ component(\'Alert\') }} {# <twig:Alert/> #}',
+        ];
     }
 }