Support for inline groups for the inline type of content tags: strong, p, summary.

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

Author: Maksym Lysak

docling/backend/html_backend.py

@@ -1794,12 +1794,27 @@ def _should_create_inline_group(
     ) -> bool:
         if len(annotated_text_list) <= 1:
             return False
+        # In non-render mode there are no source tag ids. Still keep mixed
+        # inline formatting (e.g. <p>...<strong>...</strong>) as one flow.
+        if all(
+            annotated_text.source_tag_id is None
+            for annotated_text in annotated_text_list
+        ):
+            return True
+        # Allow paragraph-like block containers to contribute inline segments
+        # when mixed with formatting tags (e.g., <p>text <strong>bold</strong>).
+        inline_group_container_tags = {"p", "address", "summary"}
         for annotated_text in annotated_text_list:
             source_tag_id = annotated_text.source_tag_id
             if source_tag_id is None:
                 return False
             tag_name = self._get_tag_name_for_docling_id(source_tag_id)
-            if tag_name is None or tag_name not in _INLINE_HTML_TAGS:
+            if tag_name is None:
+                return False
+            if (
+                tag_name not in _INLINE_HTML_TAGS
+                and tag_name not in inline_group_container_tags
+            ):
                 return False
         return True