More consistent newline handling in blocks extensions (#2553)

docs/src/markdown/about/changelog.md

@@ -8,6 +8,7 @@
 -   **FIX**: Snippets: Properly capture empty newline at end of file.
 -   **FIX**: Snippets: Fix issue where when non sections of files are included, section labels are not stripped.
 -   **FIX**: BetterEm: Fixes for complex cases.
+-   **FIX**: Blocks: More consistent handling of empty newlines in block processor extensions.
 
 ## 10.12
 

pymdownx/blocks/__init__.py

@@ -372,10 +372,10 @@ def parse_blocks(self, blocks, entry):
             if is_atomic or not is_block:
                 child = list(target)[-1] if len(target) else None
                 text = target.text if child is None else child.tail
-                b = '\n\n'.join(unescape_markdown(self.md, [b], is_atomic))
+                b = '\n\n'.join(unescape_markdown(self.md, [b], is_atomic)).strip('\n')
 
                 if text:
-                    text += '\n\n' + b
+                    text += b if not b else '\n\n' + b
                 else:
                     text = b
 

pymdownx/snippets.py

@@ -321,7 +321,7 @@ def parse_snippets(self, lines, file_name=None, is_url=False, is_section=False):
                         st = int(span[0]) if span[0] else None
                         start.append(st if st is None or st < 0 else max(0, st - 1))
                         en = int(span[1]) if len(span) > 1 and span[1] else None
-                        end.append(en if en is None or en >= 0 else en)
+                        end.append(en)
                 elif m.group(3):
                     section = m.group(3)[1:]
 

tests/test_extensions/test_blocks/test_html.py

@@ -251,8 +251,6 @@ def test_inline_and_md_in_html(self):
             **content**
             </div>
 
-
-
             <strong>content</strong></div>
             ''',
             True