rendering of markdown code blocks lacked \n

app/Factories/MarkdownFactory.php

@@ -41,6 +41,7 @@
 use League\CommonMark\Renderer\Inline\TextRenderer;
 use League\CommonMark\Util\HtmlFilter;
 
+use function rtrim;
 use function strip_tags;
 use function strtr;
 
@@ -123,7 +124,7 @@ public function markdown(string $markdown, Tree|null $tree = null): string
 
         $html = $converter->convert($markdown)->getContent();
 
-        // The markdown convert adds newlines, but not in a documented way.  Safest to ignore them.
-        return strtr($html, ["\n"   => '']);
+        // The markdown convert adds newlines, remove the last one.
+        return rtrim($html, "\n");
     }
 }

tests/Unit/Factories/MarkdownFactoryTest.php

@@ -111,7 +111,7 @@ public function testSoftLineBreaks(): void
         );
 
         self::assertSame(
-            '<p>alpha<br />beta<br />gamma<br />delta</p>',
+            "<p>alpha<br />beta<br />gamma<br />\ndelta</p>",
             $factory->markdown("alpha\nbeta\ngamma  \ndelta")
         );
     }
@@ -126,8 +126,23 @@ public function testMultipleParagraphs(): void
         );
 
         self::assertSame(
-            '<p>alpha<br />beta</p><p>gamma<br />delta</p>',
+            "<p>alpha<br />beta</p>\n<p>gamma<br />delta</p>",
             $factory->markdown("alpha\nbeta\n\n\n\ngamma\ndelta")
         );
     }
+
+    public function testMarkdownCodeBlock(): void
+    {
+        $factory = new MarkdownFactory();
+        // code block within backticks
+        self::assertSame(
+            "<pre><code>alpha\n beta\n  gamma\n   delta\n</code></pre>",
+            $factory->markdown("````\nalpha\n beta\n  gamma\n   delta\n````")
+        );
+        // code block through indentation
+        self::assertSame(
+            "<pre><code>alpha\n beta\n  gamma\n   delta\n</code></pre>",
+            $factory->markdown("    alpha\n     beta\n      gamma\n       delta")
+        );
+    }
 }