Add line-through for deleted branch on pull request view page (#32500)

Base branch deleted

![图片](https://github.com/user-attachments/assets/bc45aa33-d514-47c8-885a-de9732f2f3d5)

branch deleted comment

![图片](https://github.com/user-attachments/assets/83729bbb-2ee8-4bd3-b6f1-780d2daad3d4)

Head branch deleted

![图片](https://github.com/user-attachments/assets/90120b22-34a9-4387-aae9-5c882e8d421a)

routers/web/repo/pull.go

@@ -348,6 +348,7 @@ func PrepareViewPullInfo(ctx *context.Context, issue *issues_model.Issue) *git.C
 	}
 
 	if !baseGitRepo.IsBranchExist(pull.BaseBranch) {
+		ctx.Data["BaseBranchNotExist"] = true
 		ctx.Data["IsPullRequestBroken"] = true
 		ctx.Data["BaseTarget"] = pull.BaseBranch
 		ctx.Data["HeadTarget"] = pull.HeadBranch

templates/repo/issue/view_content/comments.tmpl

@@ -231,7 +231,8 @@
 				{{template "shared/user/avatarlink" dict "user" .Poster}}
 				<span class="text grey muted-links">
 					{{template "shared/user/authorlink" .Poster}}
-					{{ctx.Locale.Tr "repo.issues.delete_branch_at" .OldRef $createdStr}}
+					{{$oldRef := HTMLFormat `<span class="tw-line-through">%s</span>` .OldRef}}
+					{{ctx.Locale.Tr "repo.issues.delete_branch_at" $oldRef $createdStr}}
 				</span>
 			</div>
 		{{else if eq .Type 12}}

templates/repo/issue/view_title.tmpl

@@ -61,13 +61,17 @@
 					{{if .Issue.PullRequest.IsAgitFlow}}
 						{{$headHref = HTMLFormat `%s <a href="%s" target="_blank"><span class="ui label basic tiny" data-tooltip-content="%s">AGit</span></a>` $headHref "https://docs.gitea.com/usage/agit" (ctx.Locale.Tr "repo.pull.agit_documentation")}}
 					{{else}}
-						{{$headHref = HTMLFormat `<span data-tooltip-content="%s">%s</span>` (ctx.Locale.Tr "form.target_branch_not_exist") $headHref}}
+						{{$headHref = HTMLFormat `<span class="tw-line-through" data-tooltip-content="%s">%s</span>` (ctx.Locale.Tr "form.target_branch_not_exist") $headHref}}
 					{{end}}
 				{{end}}
 				{{$baseHref := .BaseTarget}}
 				{{if .BaseBranchLink}}
+					{{if .BaseBranchNotExist}}
+						{{$baseHref = HTMLFormat `<span class="tw-line-through" data-tooltip-content="%s">%s</span>` (ctx.Locale.Tr "form.target_branch_not_exist") $baseHref}}
+					{{else}}
 						{{$baseHref = HTMLFormat `<a href="%s">%s</a>` .BaseBranchLink $baseHref}}
 					{{end}}
+				{{end}}
 				{{if .Issue.PullRequest.HasMerged}}
 					{{$mergedStr:= DateUtils.TimeSince .Issue.PullRequest.MergedUnix}}
 					{{if .Issue.OriginalAuthor}}

tests/integration/pull_merge_test.go

@@ -589,7 +589,8 @@ func TestPullDontRetargetChildOnWrongRepo(t *testing.T) {
 		resp := session.MakeRequest(t, req, http.StatusOK)
 
 		htmlDoc := NewHTMLParser(t, resp.Body)
-		targetBranch := htmlDoc.doc.Find("#branch_target>a").Text()
+		// the branch has been deleted, so there is no a html tag instead of span
+		targetBranch := htmlDoc.doc.Find("#branch_target>span").Text()
 		prStatus := strings.TrimSpace(htmlDoc.doc.Find(".issue-title-meta>.issue-state-label").Text())
 
 		assert.EqualValues(t, "base-pr", targetBranch)