Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net

{
                    "vendor": "golang.org/x/net",
                    "product": "golang.org/x/net/html",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "golang.org/x/net/html",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "0.62.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "parser.addText"
                        },
                        {
                            "name": "parser.fosterParent"
                        },
                        {
                            "name": "parser.parse"
                        },
                        {
                            "name": "Parse"
                        },
                        {
                            "name": "ParseFragment"
                        },
                        {
                            "name": "ParseFragmentWithOptions"
                        },
                        {
                            "name": "ParseWithOptions"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }