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Trim newlines in the hightlight shortcode

Fixes #3898

--- a/tpl/tplimpl/template_embedded.go

+++ b/tpl/tplimpl/template_embedded.go

@@ -16,7 +16,7 @@

 func (t *templateHandler) embedShortcodes() {

 	t.addInternalShortcode("ref.html", `{{ if len .Params | eq 2 }}{{ ref .Page (.Get 0) (.Get 1) }}{{ else }}{{ ref .Page (.Get 0) }}{{ end }}`)

 	t.addInternalShortcode("relref.html", `{{ if len .Params | eq 2 }}{{ relref .Page (.Get 0) (.Get 1) }}{{ else }}{{ relref .Page (.Get 0) }}{{ end }}`)

-	t.addInternalShortcode("highlight.html", `{{ if len .Params | eq 2 }}{{ highlight .Inner (.Get 0) (.Get 1) }}{{ else }}{{ highlight .Inner (.Get 0) "" }}{{ end }}`)

+	t.addInternalShortcode("highlight.html", `{{ if len .Params | eq 2 }}{{ highlight (trim .Inner "\n\r") (.Get 0) (.Get 1) }}{{ else }}{{ highlight (trim .Inner "\n\r") (.Get 0) "" }}{{ end }}`)

 	t.addInternalShortcode("test.html", `This is a simple Test`)

 	t.addInternalShortcode("figure.html", `<!-- image -->

 <figure {{ with .Get "class" }}class="{{.}}"{{ end }}>