Improving GitHub Copilot C++ completions in Visual Studio

To reduce hallucinations, improve contextually-relevant suggestions, and provide a consistent C++ experience across Visual Studio and Visual Studio Code, related files such as headers are now automatically considered when gathering additional context for Copilot completions, even if they’re not open in the editor.

This is available to C++ users with an active GitHub Copilot subscription on Visual Studio 2022 17.12 or greater.

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