Qt 6.11

Apply the C++23 prompt first. Use these additional rules, checked against Qt 6.11.2, for Qt 6.11 applications; apply optional-module rules only when that module is used. Use a C++23-capable application toolchain. Qt generally requires C++17, while building Qt WebEngine requires C++20 support.

Version and deployment compatibility

• Select the Qt 6.11 supported OS, architecture, compiler, and runtime combination for the deployed modules; verify WebEngine's separate platform requirements. Match Qt libraries, plugins, build configuration, and compiler ABI; binary compatibility does not permit arbitrary toolchain or runtime mixing.
• Recompile application and library callers of QCborValue::fromCbor(ptr, len, error) against the 6.11.2 headers when adopting that release's length-handling fix; replacing Qt shared libraries alone does not update affected inline callers. Keep independent input-size limits.

QObject lifetime, threads, and values

• Give each QObject one deletion owner. Use the context-taking QObject::connect(sender, signal, context, functor) overload for lambdas capturing object state; enable QT_NO_CONTEXTLESS_CONNECT where practical. The context does not protect unrelated captured objects.
• Guard non-owning QObject references with QPointer and check them before use in the object's thread. A guarded pointer does not keep the object alive or make concurrent access safe.
• Keep QObject parent and child objects in the same thread, use queued delivery for work in another object's thread, and check moveToThread() success. Do not force