content adapter: Handle <!--more--> separator in content.value

[jmooring]

This may not be possible, in which case we should add a note to the content adapter documentation.

func TestFoo(t *testing.T) {
    t.Parallel()

    files := `
-- hugo.toml --
disableKinds = ['home','rss','section','sitemap','taxonomy','term']
[markup.goldmark.renderer]
unsafe = true
-- content/s1/_content.gotmpl --
{{ $page := dict
    "content" (dict "mediaType" "text/markdown" "value" "aaa <!--more--> bbb")
    "title" "p1"
    "path" "p1"
  }}
  {{ .AddPage $page }}
-- layouts/_default/single.html --
summary: {{ .Summary }}|content: {{ .Content}}
`

    b := hugolib.Test(t, files)

    b.AssertFileContent("public/s1/p1/index.html",
        "summary: aaa|content: <p>aaa bbb</p>",
    )
}

The file content assertion fails. Actual content is:

summary: aaa bbb|content: <p>aaa <!--more--> bbb</p>

Note that (a) the summary isn't correct and (b) the <--more--> separator is passed through to content.

Reference: https://discourse.gohugo.io/t/content-adapters-content-summary-not-works/50096/

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