Preserve HTML Text for link render hooks

The context now have two text methods:

* Text - rendered
* PlainText

Fixes #6629

hugolib/content_render_hooks_test.go

@@ -213,6 +213,37 @@ P3: <p>P3. xml-link: https://www.example.org|</p>
 
 }
 
+// https://github.com/gohugoio/hugo/issues/6629
+func TestRenderLinkWithMarkupInText(t *testing.T) {
+
+	b := newTestSitesBuilder(t)
+
+	b.WithTemplates("index.html", `
+{{ $p := site.GetPage "p1.md" }}
+P1: {{ $p.Content }}
+
+	`,
+		"_default/_markup/render-link.html", `html-link: {{ .Destination | safeURL }}|Text: {{ .Text | safeHTML }}|Plain: {{ .PlainText | safeHTML }}`,
+	)
+
+	b.WithContent("p1.md", `---
+title: "p1"
+---
+
+START: [**should be bold**](https://gohugo.io)END
+
+Some regular **markup**.
+`)
+
+	b.Build(BuildCfg{})
+
+	b.AssertFileContent("public/index.html", `
+  P1: <p>START: html-link: https://gohugo.io|Text: <strong>should be bold</strong>|Plain: should be boldEND</p>
+<p>Some regular <strong>markup</strong>.</p>
+`)
+
+}
+
 func TestRenderString(t *testing.T) {
 
 	b := newTestSitesBuilder(t)