helpers: Fix TrimShortHTML used by markdownify and RenderString

Closes #11698

tpl/transform/integration_test.go

@@ -0,0 +1,67 @@
+// Copyright 2023 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package transform_test
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/hugolib"
+)
+
+// Issue #11698
+func TestMarkdownifyIssue11698(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- config.toml --
+disableKinds = ['home','section','rss','sitemap','taxonomy','term']
+[markup.goldmark.parser.attribute]
+title = true
+block = true
+-- layouts/_default/single.html --
+_{{ markdownify .RawContent }}_
+-- content/p1.md --
+---
+title: p1
+---
+foo bar
+-- content/p2.md --
+---
+title: p2
+---
+foo
+
+**bar**
+-- content/p3.md --
+---
+title: p3
+---
+## foo
+
+bar
+-- content/p4.md --
+---
+title: p4
+---
+foo
+{#bar}
+  `
+
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/p1/index.html", "_foo bar_")
+	b.AssertFileContent("public/p2/index.html", "_<p>foo</p>\n<p><strong>bar</strong></p>\n_")
+	b.AssertFileContent("public/p3/index.html", "_<h2 id=\"foo\">foo</h2>\n<p>bar</p>\n_")
+	b.AssertFileContent("public/p4/index.html", "_<p id=\"bar\">foo</p>\n_")
+}