fix click create pull request button 404 (#2859)

modules/context/repo.go

@@ -424,6 +424,7 @@ func RepoAssignment() macaron.Handler {
 				return
 			}
 		}
+		ctx.Data["IsForkedRepo"] = repo.IsFork
 
 		// People who have push access or have forked repository can propose a new pull request.
 		if ctx.Repo.IsWriter() || (ctx.IsSigned && ctx.User.HasForkedRepo(ctx.Repo.Repository.ID)) {

templates/repo/home.tmpl

@@ -27,7 +27,7 @@
 		<div class="ui secondary menu">
 			{{if .PullRequestCtx.Allowed}}
 				<div class="fitted item">
-					<a href="{{.BaseRepo.Link}}/compare/{{.BaseRepo.DefaultBranch}}...{{if .SignedUser.HasForkedRepo .BaseRepo.ID }}{{.SignedUser.Name}}:{{end}}{{.BranchName}}">
+					<a href="{{.BaseRepo.Link}}/compare/{{.BaseRepo.DefaultBranch}}...{{if .IsForkedRepo}}{{.Repository.Owner.Name}}:{{else}}{{if .SignedUser.HasForkedRepo .BaseRepo.ID}}{{.SignedUser.Name}}:{{end}}{{end}}{{.BranchName}}">
 						<button class="ui green tiny compact button"><i class="octicon octicon-git-compare"></i></button>
 					</a>
 				</div>