[GITEA] Revert "Make `user-content-* ` consistent with github (#26388)"

Refs: https://codeberg.org/forgejo/forgejo/issues/1943

This reverts commit d41aee1d1e.

(cherry picked from commit d29ec91e91)
(cherry picked from commit a0f5a9750e)
(cherry picked from commit 26bfc3bc14)
(cherry picked from commit 59f57a1bc9)
(cherry picked from commit ce3b73a033)
(cherry picked from commit 2c426c28af)
(cherry picked from commit 155a08bca7)
(cherry picked from commit 8934fd895c)

modules/markup/common/footnote.go

@@ -29,12 +29,17 @@ func CleanValue(value []byte) []byte {
 	value = bytes.TrimSpace(value)
 	rs := bytes.Runes(value)
 	result := make([]rune, 0, len(rs))
+	needsDash := false
 	for _, r := range rs {
-		if unicode.IsLetter(r) || unicode.IsNumber(r) || r == '_' || r == '-' {
+		switch {
+		case unicode.IsLetter(r) || unicode.IsNumber(r) || r == '_':
+			if needsDash && len(result) > 0 {
+				result = append(result, '-')
+			}
+			needsDash = false
 			result = append(result, unicode.ToLower(r))
-		}
-		if unicode.IsSpace(r) {
-			result = append(result, '-')
+		default:
+			needsDash = true
 		}
 	}
 	return []byte(string(result))

modules/markup/common/footnote_test.go

@@ -1,60 +0,0 @@
-// Copyright 2023 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-package common
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestCleanValue(t *testing.T) {
-	tests := []struct {
-		param  string
-		expect string
-	}{
-		// Github behavior test cases
-		{"", ""},
-		{"test(0)", "test0"},
-		{"test!1", "test1"},
-		{"test:2", "test2"},
-		{"test*3", "test3"},
-		{"test！4", "test4"},
-		{"test：5", "test5"},
-		{"test*6", "test6"},
-		{"test：6 a", "test6-a"},
-		{"test：6 !b", "test6-b"},
-		{"test：ad # df", "testad--df"},
-		{"test：ad #23 df 2*/*", "testad-23-df-2"},
-		{"test：ad 23 df 2*/*", "testad-23-df-2"},
-		{"test：ad # 23 df 2*/*", "testad--23-df-2"},
-		{"Anchors in Markdown", "anchors-in-markdown"},
-		{"a_b_c", "a_b_c"},
-		{"a-b-c", "a-b-c"},
-		{"a-b-c----", "a-b-c----"},
-		{"test：6a", "test6a"},
-		{"test：a6", "testa6"},
-		{"tes a a   a  a", "tes-a-a---a--a"},
-		{"  tes a a   a  a  ", "tes-a-a---a--a"},
-		{"Header with \"double quotes\"", "header-with-double-quotes"},
-		{"Placeholder to force scrolling on link's click", "placeholder-to-force-scrolling-on-links-click"},
-		{"tes（）", "tes"},
-		{"tes（0）", "tes0"},
-		{"tes{0}", "tes0"},
-		{"tes[0]", "tes0"},
-		{"test【0】", "test0"},
-		{"tes…@a", "tesa"},
-		{"tes￥& a", "tes-a"},
-		{"tes= a", "tes-a"},
-		{"tes|a", "tesa"},
-		{"tes\\a", "tesa"},
-		{"tes/a", "tesa"},
-		{"a啊啊b", "a啊啊b"},
-		{"c🤔️🤔️d", "cd"},
-		{"a⚡a", "aa"},
-		{"e.~f", "ef"},
-	}
-	for _, test := range tests {
-		assert.Equal(t, []byte(test.expect), CleanValue([]byte(test.param)), test.param)
-	}
-}