style: Fix linting errors in patch_flex_coder.py

aider/coders/patch_flex_coder.py

@@ -1,9 +1,9 @@
 # At the top of the file, add necessary imports
 import itertools
 import pathlib
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from enum import Enum
-from typing import Dict, List, Optional, Tuple
+from typing import List, Optional, Tuple
 
 # Keep existing imports like dump, Coder, PatchPrompts, DiffError, ActionType
 from ..dump import dump  # noqa: F401
@@ -13,8 +13,7 @@ from .patch_prompts import PatchPrompts
 # Import search_replace utilities
 from .search_replace import editblock_strategies, flexible_search_and_replace
 
-# Remove original Chunk, PatchAction, EditResult, Patch dataclasses if they exist at the top
-# Remove helper functions: _norm, find_context_core, find_context, peek_next_section, identify_files_needed
+# Remove original PatchCoder domain objects and helpers if they exist at the top.
 # We will redefine or replace these as needed.
 
 
@@ -277,9 +276,9 @@ class PatchFlexCoder(Coder):  # Rename class
                 index += 1
                 if not path:
                     raise DiffError(f"Update File action missing path (line {line_num}).")
-                # We don't check for duplicates here, multiple UPDATEs for the same file are handled sequentially.
-                # if path not in known_files: # Check if file is known (in chat or mentioned)
-                #     self.io.tool_warning(f"Update File target '{path}' not found in chat context.")
+                # We don't check for duplicates; multiple UPDATEs for the same file are handled sequentially.
+                # if path not in known_files:
+                #     self.io.tool_warning(f"Update target '{path}' not in chat context.")
 
                 current_file_path = path
                 current_move_path = None  # Reset move path for new file