sage -fixdoctests: Do not remove comments that precede annotations

Author: Matthias Koeppe

src/sage/doctest/parsing.py

@@ -141,6 +141,17 @@ def parse_optional_tags(string):
     # strip_string_literals replaces comments
     comment = "#" + (literals[comment]).lower()
 
+    if return_string_sans_tags:
+        # skip non-tag comments that precede the first tag comment
+        if m := optional_regex.search(comment):
+            sharp_index = comment[:m.start(0)].rfind('#')
+            if sharp_index >= 0:
+                first_line += comment[:sharp_index]
+                comment = comment[sharp_index:]
+        else:
+            # no non-tag comment
+            return set(), string
+
     tags = []
     for m in optional_regex.finditer(comment):
         cmd = m.group(1)