src/vs/workbench/services/keybinding/common/macLinuxKeyboardMapper.ts/MacLinuxKeyboardMapper/getUILabelForScanCodeBinding
class MacLinuxKeyboardMapper:	public getUILabelForScanCodeBinding(binding: ScanCodeBinding | null): string | null {
		if (!binding) {
			return null;
		}
		if (binding.isDuplicateModifierCase()) {
			return '';
		}
		if (this._OS === OperatingSystem.Macintosh) {
			switch (binding.scanCode) {
				case ScanCode.ArrowLeft:
					return '←';
				case ScanCode.ArrowUp:
					return '↑';
				case ScanCode.ArrowRight:
					return '→';
				case ScanCode.ArrowDown:
					return '↓';
			}
		}
		return this._scanCodeToLabel[binding.scanCode];
	}