See if we can bump C++ to 23 on targeting CI

[wengxt]

Summary by CodeRabbit

• Enhancements
  • Updated the project to use the C++23 language standard for improved compatibility with modern C++ features.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f3f8a7d2-30cd-4eb8-a76e-d2074a174e1f

📥 Commits

Reviewing files that changed from the base of the PR and between 6f8f9fa and ff10868.

📒 Files selected for processing (1)

• cmake/Fcitx5CompilerSettings.cmake

🚧 Files skipped from review as they are similar to previous changes (1)

• cmake/Fcitx5CompilerSettings.cmake

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📝 Walkthrough

Walkthrough

The project-wide C++ standard is updated from C++20 to C++23 in the shared CMake compiler settings.

Changes

C++23 compiler standard

Layer / File(s)	Summary
Update project compiler standard cmake/Fcitx5CompilerSettings.cmake	CMAKE_CXX_STANDARD changes from 20 to 23.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: evaluating an upgrade to C++23 for CI targeting.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 23

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