src/vs/editor/contrib/editorState/browser/keybindingCancellation.ts/EditorKeybindingCancellationTokenSource/constructor
class EditorKeybindingCancellationTokenSource:	constructor(readonly editor: ICodeEditor, parent?: CancellationToken) {
		super(parent);
		this._unregister = editor.invokeWithinContext(accessor => accessor.get(IEditorCancellationTokens).add(editor, this));
	}