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markup/goldmark: Adjust auto ID space handling

GitHub does not consider tabs as delimiter, see https://github.com/bep/portable-hugo-links/blob/master/blog/p2.md

Closes #6710

--- a/markup/goldmark/autoid.go

+++ b/markup/goldmark/autoid.go

@@ -58,7 +58,7 @@

 			r, size := utf8.DecodeRune(b)

 			switch {

 			case asciiOnly && size != 1:

-			case r == '-' || isSpace(r):

+			case r == '-' || r == ' ':

 				buf.WriteRune('-')

 			case isAlphaNumeric(r):

 				buf.WriteRune(unicode.ToLower(r))

@@ -83,10 +83,6 @@

 func isAlphaNumeric(r rune) bool {

 	return r == '_' || unicode.IsLetter(r) || unicode.IsDigit(r)

-}

-

-func isSpace(r rune) bool {

-	return r == ' ' || r == '\t'

 }

 var _ parser.IDs = (*idFactory)(nil)

--- a/markup/goldmark/autoid_test.go

+++ b/markup/goldmark/autoid_test.go

@@ -40,6 +40,8 @@

 Forward/slash

 Backward\slash

 Under_score

+Nonbreaking Space

+Tab	Space

 `

 	expect := `

@@ -56,6 +58,8 @@

 forwardslash

 backwardslash

 under_score

+nonbreakingspace

+tabspace

 `

 	tests, expect = strings.TrimSpace(tests), strings.TrimSpace(expect)