src/vs/workbench/services/keybinding/common/windowsKeyboardMapper.ts/WindowsNativeResolvedKeybinding/_getSingleModifierDispatchPart
class WindowsNativeResolvedKeybinding:	protected _getSingleModifierDispatchPart(keybinding: SimpleKeybinding): KeybindingModifier | null {
		if (keybinding.keyCode === KeyCode.Ctrl && !keybinding.shiftKey && !keybinding.altKey && !keybinding.metaKey) {
			return 'ctrl';
		}
		if (keybinding.keyCode === KeyCode.Shift && !keybinding.ctrlKey && !keybinding.altKey && !keybinding.metaKey) {
			return 'shift';
		}
		if (keybinding.keyCode === KeyCode.Alt && !keybinding.ctrlKey && !keybinding.shiftKey && !keybinding.metaKey) {
			return 'alt';
		}
		if (keybinding.keyCode === KeyCode.Meta && !keybinding.ctrlKey && !keybinding.shiftKey && !keybinding.altKey) {
			return 'meta';
		}
		return null;
	}