Improve lambda signature detection and Qt access macro support

[imakris]

Summary

This PR enhances the hanging indent fixer to better handle complex lambda signatures and adds support for Qt-specific access macros. The changes improve the robustness of lambda detection by properly handling comments between signature and body, and correctly identifying lambda captures across multiple lines.

Key Changes

• Enhanced lambda signature detection: Replaced two separate functions (stripped_lines_complete_lambda_signature and previous_lines_complete_lambda_signature) with a unified complete_lambda_signature() function that:

  • Properly handles comment-only lines as transparent (they don't break signature detection)
  • Correctly matches opening and closing brackets in lambda captures using a new iter_brackets_outside_strings() utility
  • Validates that lambda captures are properly preceded and followed by valid tokens
  • Extends the lookback window from 5 to 30 lines to handle long multiline captures

• New utility functions:

  • is_comment_only_line(): Identifies lines that contain only comments (single-line // or block /* */)
  • iter_brackets_outside_strings(): Safely iterates over brackets while respecting string literals, character literals, and comments
  • find_matching_capture_open(): Walks backward to find the opening bracket of a lambda capture, handling nested brackets

• Qt macro support: Extended is_access_label() to recognize Qt-specific access macros:

  • Q_SIGNALS: and Q_SLOTS:
  • public Q_SLOTS:, protected Q_SLOTS:, private Q_SLOTS:

• Refactored indent normalization: Consolidated lambda_body_needs_sibling_indent_normalization() logic into normalize_lambda_body_sibling_indent() to avoid duplicate traversal and improve efficiency

• Improved robustness: The new implementation correctly handles edge cases like:

  • Comments between lambda signature and opening brace
  • Array indexing (e.g., values[0]) followed by blocks (not mistaken for lambdas)
  • Long multiline lambda captures with proper indentation repair

Test Coverage

Added comprehensive test cases covering:

• Comments between lambda signature and body brace
• Long multiline captures with body indent repair
• Array indexing not mistaken for lambda captures
• Qt access macros inside lambda bodies

https://claude.ai/code/session_01Qem2GwtMxGuSDDjK7gQpvG