Copilot floundering

Author: Asbelos

.github/workflows/mkdocsbuild.yml

@@ -43,7 +43,7 @@ jobs:
           css = css_path.read_text(encoding="utf-8")
 
           # Ensure the first rendered code block is still multiline in generated HTML.
-          match = re.search(r'<div class="highlight"><pre><span></span><code>(.*?)</code></pre></div>', html, re.DOTALL)
+          match = re.search(r'<div class="language-\w+ highlight"><pre><span></span><code>(.*?)</code></pre></div>', html, re.DOTALL)
           if not match:
               print("Could not locate a rendered fenced code block in passing-loop page")
               sys.exit(1)

test_regression.py

@@ -0,0 +1,41 @@
+from pathlib import Path
+import re
+import sys
+
+html_path = Path("site/products/ex-commandstation/exrail/cookbooks/driving-trains/passing-loop/index.html")
+css_path = Path("site/_static/css/dccex_theme.css")
+
+if not html_path.exists():
+    print(f"Missing expected page: {html_path}")
+    sys.exit(1)
+if not css_path.exists():
+    print(f"Missing expected stylesheet: {css_path}")
+    sys.exit(1)
+
+html = html_path.read_text(encoding="utf-8")
+css = css_path.read_text(encoding="utf-8")
+
+# Ensure the first rendered code block is still multiline in generated HTML.
+match = re.search(r'<div class="language-\w+ highlight"><pre><span></span><code>(.*?)</code></pre></div>', html, re.DOTALL)
+if not match:
+    print("Could not locate a rendered fenced code block in passing-loop page")
+    # Let's look for what we actually have
+    highlight_match = re.search(r'<div class="highlight">(.*?)</div>', html, re.DOTALL)
+    if highlight_match:
+        print("\nFound highlight div with content (first 500 chars):")
+        content = highlight_match.group(1)[:500]
+        print(content)
+        print("\n...")
+    else:
+        print("\nNo highlight divs found at all")
+    sys.exit(1)
+if "\n" not in match.group(1):
+    print("Rendered fenced code block no longer contains line breaks")
+    sys.exit(1)
+
+# Ensure our CSS safeguard that preserves preformatted line breaks is present.
+if "white-space: pre !important;" not in css:
+    print("Missing white-space safeguard for code blocks in compiled CSS")
+    sys.exit(1)
+
+print("Regression checks passed: multiline code block and CSS safeguard present")