src/vs/editor/contrib/peekView/peekView.ts/PeekContextController/constructor
class PeekContextController:	constructor(
		editor: ICodeEditor,
		@IContextKeyService contextKeyService: IContextKeyService
	) {
		if (editor instanceof EmbeddedCodeEditorWidget) {
			PeekContext.inPeekEditor.bindTo(contextKeyService);
		}
	}