Fix multi line diff bug

Author: woojiahao

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "difflib-parser"
-version = "1.2.1"
+version = "1.2.2"
 authors = [{ name = "Jiahao, Woo", email = "woojiahao1234@gmail.com" }]
 description = "Lightweight Python package for parsing Python difflib's diff results"
 readme = "README.md"

src/difflib_parser/difflib_parser.py

@@ -39,8 +39,8 @@ def __init__(self, left_text: List[str], right_text: List[str]):
         self.__line_no = 0
 
     def iter_diffs(self) -> Iterator[Diff]:
-        current_line = self.__diff[self.__line_no]
         while self.__line_no < len(self.__diff):
+            current_line = self.__diff[self.__line_no]
             diff_line = DiffLine.parse(current_line)
             if diff_line.line is None:
                 self.__line_no += 1