Change log for 1.23.1 (#33191)

Backport #33187 (no conflict)

Co-authored-by: Harry Vince <47283812+harryvince@users.noreply.github.com>

CHANGELOG.md

@@ -4,6 +4,20 @@ This changelog goes through the changes that have been made in each release
 without substantial changes to our git log; to see the highlights of what has
 been added to each release, please refer to the [blog](https://blog.gitea.com).
 
+## [1.23.1](https://github.com/go-gitea/gitea/releases/tag/v1.23.1) - 2025-01-09
+
+* ENHANCEMENTS
+  * Move repo size to sidebar (#33155) (#33182)
+* BUGFIXES
+  * Use updated path to s6-svscan after alpine upgrade (#33185) (#33188)
+  * Fix fuzz test (#33156) (#33158)
+  * Fix raw file API ref handling (#33172) (#33189)
+  * Fix ACME panic (#33178) (#33186)
+  * Fix branch dropdown not display ref name (#33159) (#33183)
+  * Fix assignee list overlapping in Issue sidebar (#33176) (#33181)
+  * Fix sync fork for consistency (#33147) #33192
+  * Fix editor markdown not incrementing in a numbered list (#33187) #33193
+
 ## [1.23.0](https://github.com/go-gitea/gitea/releases/tag/v1.23.0) - 2025-01-08
 
 * BREAKING

cmd/web_acme.go

@@ -54,8 +54,10 @@ func runACME(listenAddr string, m http.Handler) error {
 		altTLSALPNPort = p
 	}
 
-	magic := &certmagic.Default
+	// FIXME: this path is not right, it uses "AppWorkPath" incorrectly, and writes the data into "AppWorkPath/https"
-	magic.Storage = &certmagic.FileStorage{Path: setting.AcmeLiveDirectory}
+	// Ideally it should migrate to AppDataPath write to "AppDataPath/https"
+	certmagic.Default.Storage = &certmagic.FileStorage{Path: setting.AcmeLiveDirectory}
+	magic := certmagic.NewDefault()
 	// Try to use private CA root if provided, otherwise defaults to system's trust
 	var certPool *x509.CertPool
 	if setting.AcmeCARoot != "" {

docker/root/usr/bin/entrypoint

@@ -37,5 +37,5 @@ done
 if [ $# -gt 0 ]; then
     exec "$@"
 else
-    exec /bin/s6-svscan /etc/s6
+    exec /usr/bin/s6-svscan /etc/s6
 fi

modules/auth/pam/pam_test.go

@@ -15,5 +15,5 @@ func TestPamAuth(t *testing.T) {
 	result, err := Auth("gitea", "user1", "false-pwd")
 	assert.Error(t, err)
 	assert.EqualError(t, err, "Authentication failure")
-	assert.Len(t, result)
+	assert.Empty(t, result)
 }

modules/structs/repo_branch.go

@@ -133,3 +133,11 @@ type EditBranchProtectionOption struct {
 type UpdateBranchProtectionPriories struct {
 	IDs []int64 `json:"ids"`
 }
+
+type MergeUpstreamRequest struct {
+	Branch string `json:"branch"`
+}
+
+type MergeUpstreamResponse struct {
+	MergeStyle string `json:"merge_type"`
+}

routers/api/v1/api.go

@@ -1190,6 +1190,7 @@ func Routes() *web.Router {
 				m.Get("/archive/*", reqRepoReader(unit.TypeCode), repo.GetArchive)
 				m.Combo("/forks").Get(repo.ListForks).
 					Post(reqToken(), reqRepoReader(unit.TypeCode), bind(api.CreateForkOption{}), repo.CreateFork)
+				m.Post("/merge-upstream", reqToken(), mustNotBeArchived, reqRepoWriter(unit.TypeCode), bind(api.MergeUpstreamRequest{}), repo.MergeUpstream)
 				m.Group("/branches", func() {
 					m.Get("", repo.ListBranches)
 					m.Get("/*", repo.GetBranch)

routers/api/v1/repo/branch.go

@@ -19,6 +19,7 @@ import (
 	"code.gitea.io/gitea/modules/optional"
 	repo_module "code.gitea.io/gitea/modules/repository"
 	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers/api/v1/utils"
 	"code.gitea.io/gitea/services/context"
@@ -1194,3 +1195,47 @@ func UpdateBranchProtectionPriories(ctx *context.APIContext) {
 
 	ctx.Status(http.StatusNoContent)
 }
+
+func MergeUpstream(ctx *context.APIContext) {
+	// swagger:operation POST /repos/{owner}/{repo}/merge-upstream repository repoMergeUpstream
+	// ---
+	// summary: Merge a branch from upstream
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: owner
+	//   in: path
+	//   description: owner of the repo
+	//   type: string
+	//   required: true
+	// - name: repo
+	//   in: path
+	//   description: name of the repo
+	//   type: string
+	//   required: true
+	// - name: body
+	//   in: body
+	//   schema:
+	//     "$ref": "#/definitions/MergeUpstreamRequest"
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/MergeUpstreamResponse"
+	//   "400":
+	//     "$ref": "#/responses/error"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	form := web.GetForm(ctx).(*api.MergeUpstreamRequest)
+	mergeStyle, err := repo_service.MergeUpstream(ctx, ctx.Doer, ctx.Repo.Repository, form.Branch)
+	if err != nil {
+		if errors.Is(err, util.ErrInvalidArgument) {
+			ctx.Error(http.StatusBadRequest, "MergeUpstream", err)
+			return
+		} else if errors.Is(err, util.ErrNotExist) {
+			ctx.Error(http.StatusNotFound, "MergeUpstream", err)
+			return
+		}
+		ctx.Error(http.StatusInternalServerError, "MergeUpstream", err)
+		return
+	}
+	ctx.JSON(http.StatusOK, &api.MergeUpstreamResponse{MergeStyle: mergeStyle})
+}

routers/api/v1/swagger/repo.go

@@ -448,3 +448,15 @@ type swaggerCompare struct {
 	// in:body
 	Body api.Compare `json:"body"`
 }
+
+// swagger:response MergeUpstreamRequest
+type swaggerMergeUpstreamRequest struct {
+	// in:body
+	Body api.MergeUpstreamRequest `json:"body"`
+}
+
+// swagger:response MergeUpstreamResponse
+type swaggerMergeUpstreamResponse struct {
+	// in:body
+	Body api.MergeUpstreamResponse `json:"body"`
+}

services/context/api.go

@@ -305,8 +305,7 @@ func RepoRefForAPI(next http.Handler) http.Handler {
 			return
 		}
 
-		// NOTICE: the "ref" here for internal usage only (e.g. woodpecker)
+		refName, _ := getRefNameLegacy(ctx.Base, ctx.Repo, ctx.PathParam("*"), ctx.FormTrim("ref"))
-		refName, _ := getRefNameLegacy(ctx.Base, ctx.Repo, ctx.FormTrim("ref"))
 		var err error
 
 		if ctx.Repo.GitRepo.IsBranchExist(refName) {

services/context/repo.go

@@ -769,35 +769,30 @@ func getRefNameFromPath(repo *Repository, path string, isExist func(string) bool
 	return ""
 }
 
-func getRefNameLegacy(ctx *Base, repo *Repository, optionalExtraRef ...string) (string, RepoRefType) {
+func getRefNameLegacy(ctx *Base, repo *Repository, reqPath, extraRef string) (string, RepoRefType) {
-	extraRef := util.OptionalArg(optionalExtraRef)
+	reqRefPath := path.Join(extraRef, reqPath)
-	reqPath := ctx.PathParam("*")
+	reqRefPathParts := strings.Split(reqRefPath, "/")
-	reqPath = path.Join(extraRef, reqPath)
+	if refName := getRefName(ctx, repo, reqRefPath, RepoRefBranch); refName != "" {
-
-	if refName := getRefName(ctx, repo, RepoRefBranch); refName != "" {
 		return refName, RepoRefBranch
 	}
-	if refName := getRefName(ctx, repo, RepoRefTag); refName != "" {
+	if refName := getRefName(ctx, repo, reqRefPath, RepoRefTag); refName != "" {
 		return refName, RepoRefTag
 	}
-
+	if git.IsStringLikelyCommitID(git.ObjectFormatFromName(repo.Repository.ObjectFormatName), reqRefPathParts[0]) {
-	// For legacy support only full commit sha
-	parts := strings.Split(reqPath, "/")
-	if git.IsStringLikelyCommitID(git.ObjectFormatFromName(repo.Repository.ObjectFormatName), parts[0]) {
 		// FIXME: this logic is different from other types. Ideally, it should also try to GetCommit to check if it exists
-		repo.TreePath = strings.Join(parts[1:], "/")
+		repo.TreePath = strings.Join(reqRefPathParts[1:], "/")
-		return parts[0], RepoRefCommit
+		return reqRefPathParts[0], RepoRefCommit
 	}
-
+	if refName := getRefName(ctx, repo, reqPath, RepoRefBlob); refName != "" {
-	if refName := getRefName(ctx, repo, RepoRefBlob); len(refName) > 0 {
 		return refName, RepoRefBlob
 	}
+	// FIXME: the old code falls back to default branch if "ref" doesn't exist, there could be an edge case:
+	// "README?ref=no-such" would read the README file from the default branch, but the user might expect a 404
 	repo.TreePath = reqPath
 	return repo.Repository.DefaultBranch, RepoRefBranch
 }
 
-func getRefName(ctx *Base, repo *Repository, pathType RepoRefType) string {
+func getRefName(ctx *Base, repo *Repository, path string, pathType RepoRefType) string {
-	path := ctx.PathParam("*")
 	switch pathType {
 	case RepoRefBranch:
 		ref := getRefNameFromPath(repo, path, repo.GitRepo.IsBranchExist)
@@ -900,7 +895,8 @@ func RepoRefByType(detectRefType RepoRefType, opts ...RepoRefByTypeOptions) func
 		}
 
 		// Get default branch.
-		if len(ctx.PathParam("*")) == 0 {
+		reqPath := ctx.PathParam("*")
+		if reqPath == "" {
 			refName = ctx.Repo.Repository.DefaultBranch
 			if !ctx.Repo.GitRepo.IsBranchExist(refName) {
 				brs, _, err := ctx.Repo.GitRepo.GetBranches(0, 1)
@@ -925,12 +921,12 @@ func RepoRefByType(detectRefType RepoRefType, opts ...RepoRefByTypeOptions) func
 				return cancel
 			}
 			ctx.Repo.IsViewBranch = true
-		} else {
+		} else { // there is a path in request
 			guessLegacyPath := refType == RepoRefUnknown
 			if guessLegacyPath {
-				refName, refType = getRefNameLegacy(ctx.Base, ctx.Repo)
+				refName, refType = getRefNameLegacy(ctx.Base, ctx.Repo, reqPath, "")
 			} else {
-				refName = getRefName(ctx.Base, ctx.Repo, refType)
+				refName = getRefName(ctx.Base, ctx.Repo, reqPath, refType)
 			}
 			ctx.Repo.RefName = refName
 			isRenamedBranch, has := ctx.Data["IsRenamedBranch"].(bool)

services/repository/merge_upstream.go

@@ -12,17 +12,19 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/gitrepo"
 	repo_module "code.gitea.io/gitea/modules/repository"
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/services/pull"
 )
 
 type UpstreamDivergingInfo struct {
-	BaseIsNewer   bool
+	BaseHasNewCommits bool
-	CommitsBehind int
+	CommitsBehind     int
-	CommitsAhead  int
+	CommitsAhead      int
 }
 
+// MergeUpstream merges the base repository's default branch into the fork repository's current branch.
 func MergeUpstream(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, branch string) (mergeStyle string, err error) {
 	if err = repo.MustNotBeArchived(); err != nil {
 		return "", err
@@ -32,7 +34,7 @@ func MergeUpstream(ctx context.Context, doer *user_model.User, repo *repo_model.
 	}
 	err = git.Push(ctx, repo.BaseRepo.RepoPath(), git.PushOptions{
 		Remote: repo.RepoPath(),
-		Branch: fmt.Sprintf("%s:%s", branch, branch),
+		Branch: fmt.Sprintf("%s:%s", repo.BaseRepo.DefaultBranch, branch),
 		Env:    repo_module.PushingEnvironment(doer, repo),
 	})
 	if err == nil {
@@ -64,7 +66,7 @@ func MergeUpstream(ctx context.Context, doer *user_model.User, repo *repo_model.
 		BaseRepoID: repo.BaseRepo.ID,
 		BaseRepo:   repo.BaseRepo,
 		HeadBranch: branch, // maybe HeadCommitID is not needed
-		BaseBranch: branch,
+		BaseBranch: repo.BaseRepo.DefaultBranch,
 	}
 	fakeIssue.PullRequest = fakePR
 	err = pull.Update(ctx, fakePR, doer, "merge upstream", false)
@@ -74,6 +76,7 @@ func MergeUpstream(ctx context.Context, doer *user_model.User, repo *repo_model.
 	return "merge", nil
 }
 
+// GetUpstreamDivergingInfo returns the information about the divergence between the fork repository's branch and the base repository's default branch.
 func GetUpstreamDivergingInfo(ctx context.Context, repo *repo_model.Repository, branch string) (*UpstreamDivergingInfo, error) {
 	if !repo.IsFork {
 		return nil, util.NewInvalidArgumentErrorf("repo is not a fork")
@@ -92,7 +95,7 @@ func GetUpstreamDivergingInfo(ctx context.Context, repo *repo_model.Repository,
 		return nil, err
 	}
 
-	baseBranch, err := git_model.GetBranch(ctx, repo.BaseRepo.ID, branch)
+	baseBranch, err := git_model.GetBranch(ctx, repo.BaseRepo.ID, repo.BaseRepo.DefaultBranch)
 	if err != nil {
 		return nil, err
 	}
@@ -102,14 +105,42 @@ func GetUpstreamDivergingInfo(ctx context.Context, repo *repo_model.Repository,
 		return info, nil
 	}
 
-	// TODO: if the fork repo has new commits, this call will fail:
+	// if the fork repo has new commits, this call will fail because they are not in the base repo
 	// exit status 128 - fatal: Invalid symmetric difference expression aaaaaaaaaaaa...bbbbbbbbbbbb
-	// so at the moment, we are not able to handle this case, should be improved in the future
+	// so at the moment, we first check the update time, then check whether the fork branch has base's head
 	diff, err := git.GetDivergingCommits(ctx, repo.BaseRepo.RepoPath(), baseBranch.CommitID, forkBranch.CommitID)
 	if err != nil {
-		info.BaseIsNewer = baseBranch.UpdatedUnix > forkBranch.UpdatedUnix
+		info.BaseHasNewCommits = baseBranch.UpdatedUnix > forkBranch.UpdatedUnix
+		if info.BaseHasNewCommits {
+			return info, nil
+		}
+
+		// if the base's update time is before the fork, check whether the base's head is in the fork
+		baseGitRepo, baseGitRepoCloser, err := gitrepo.RepositoryFromContextOrOpen(ctx, repo.BaseRepo)
+		if err != nil {
+			return nil, err
+		}
+		defer baseGitRepoCloser.Close()
+
+		headGitRepo, headGitRepoCloser, err := gitrepo.RepositoryFromContextOrOpen(ctx, repo)
+		if err != nil {
+			return nil, err
+		}
+		defer headGitRepoCloser.Close()
+
+		baseCommitID, err := baseGitRepo.ConvertToGitID(baseBranch.CommitID)
+		if err != nil {
+			return nil, err
+		}
+		headCommit, err := headGitRepo.GetCommit(forkBranch.CommitID)
+		if err != nil {
+			return nil, err
+		}
+		hasPreviousCommit, _ := headCommit.HasPreviousCommit(baseCommitID)
+		info.BaseHasNewCommits = !hasPreviousCommit
 		return info, nil
 	}
+
 	info.CommitsBehind, info.CommitsAhead = diff.Behind, diff.Ahead
 	return info, nil
 }

templates/repo/branch_dropdown.tmpl

@@ -1,8 +1,8 @@
 {{/* Attributes:
 * ContainerClasses
 * Repository
-* CurrentRefType: eg. "branch", "tag"
+* CurrentRefType: eg. "branch", "tag", "commit"
-* CurrentRefShortName: eg. "master", "v1.0"
+* CurrentRefShortName: eg. "master", "v1.0", "abcdef0123"
 * CurrentTreePath
 * RefLinkTemplate: redirect to the link when a branch/tag is selected
 * RefFormActionTemplate: change the parent form's action when a branch/tag is selected

templates/repo/code/upstream_diverging_info.tmpl

@@ -1,8 +1,8 @@
-{{if and .UpstreamDivergingInfo (or .UpstreamDivergingInfo.BaseIsNewer .UpstreamDivergingInfo.CommitsBehind)}}
+{{if and .UpstreamDivergingInfo (or .UpstreamDivergingInfo.BaseHasNewCommits .UpstreamDivergingInfo.CommitsBehind)}}
 <div class="ui message flex-text-block">
 	<div class="tw-flex-1">
-		{{$upstreamLink := printf "%s/src/branch/%s" .Repository.BaseRepo.Link (.BranchName|PathEscapeSegments)}}
+		{{$upstreamLink := printf "%s/src/branch/%s" .Repository.BaseRepo.Link (.Repository.BaseRepo.DefaultBranch|PathEscapeSegments)}}
-		{{$upstreamHtml := HTMLFormat `<a href="%s">%s:%s</a>` $upstreamLink .Repository.BaseRepo.FullName .BranchName}}
+		{{$upstreamHtml := HTMLFormat `<a href="%s">%s:%s</a>` $upstreamLink .Repository.BaseRepo.FullName .Repository.BaseRepo.DefaultBranch}}
 		{{if .UpstreamDivergingInfo.CommitsBehind}}
 			{{ctx.Locale.TrN .UpstreamDivergingInfo.CommitsBehind "repo.pulls.upstream_diverging_prompt_behind_1" "repo.pulls.upstream_diverging_prompt_behind_n" .UpstreamDivergingInfo.CommitsBehind $upstreamHtml}}
 		{{else}}

templates/repo/commits.tmpl

@@ -5,14 +5,19 @@
 		{{template "repo/sub_menu" .}}
 		<div class="repo-button-row">
 			<div class="repo-button-row-left">
-
+				{{- /* for /owner/repo/commits/branch/the-name */ -}}
-				{{$branchDropdownCurrentRefType := "branch"}}
+				{{- $branchDropdownCurrentRefType := "branch" -}}
-				{{$branchDropdownCurrentRefShortName := .BranchName}}
+				{{- $branchDropdownCurrentRefShortName := .BranchName -}}
-				{{if .IsViewTag}}
+				{{- if .IsViewTag -}}
-					{{$branchDropdownCurrentRefType = "tag"}}
+					{{- /* for /owner/repo/commits/tag/the-name */ -}}
-					{{$branchDropdownCurrentRefShortName = .TagName}}
+					{{- $branchDropdownCurrentRefType = "tag" -}}
-				{{end}}
+					{{- $branchDropdownCurrentRefShortName = .TagName -}}
-				{{template "repo/branch_dropdown" dict
+				{{- else if .IsViewCommit -}}
+					{{- /* for /owner/repo/commits/commit/000000 */ -}}
+					{{- $branchDropdownCurrentRefType = "commit" -}}
+					{{- $branchDropdownCurrentRefShortName = ShortSha .CommitID -}}
+				{{- end -}}
+				{{- template "repo/branch_dropdown" dict
 					"Repository" .Repository
 					"ShowTabBranches" true
 					"ShowTabTags" true
@@ -21,8 +26,7 @@
 					"CurrentTreePath" .TreePath
 					"RefLinkTemplate" "{RepoLink}/commits/{RefType}/{RefShortName}/{TreePath}"
 					"AllowCreateNewRef" .CanCreateBranch
-				}}
+				-}}
-
 				<a href="{{.RepoLink}}/graph" class="ui basic small compact button">
 					{{svg "octicon-git-branch"}}
 					{{ctx.Locale.Tr "repo.commit_graph"}}

templates/repo/home.tmpl

@@ -24,13 +24,19 @@
 				{{template "repo/sub_menu" .}}
 				<div class="repo-button-row">
 					<div class="repo-button-row-left">
-						{{$branchDropdownCurrentRefType := "branch"}}
+						{{- /* for repo home (default branch) and /owner/repo/src/branch/the-name */ -}}
-						{{$branchDropdownCurrentRefShortName := .BranchName}}
+						{{- $branchDropdownCurrentRefType := "branch" -}}
-						{{if .IsViewTag}}
+						{{- $branchDropdownCurrentRefShortName := .BranchName -}}
-							{{$branchDropdownCurrentRefType = "tag"}}
+						{{- if .IsViewTag -}}
-							{{$branchDropdownCurrentRefShortName = .TagName}}
+							{{- /* for /owner/repo/src/tag/the-name */ -}}
-						{{end}}
+							{{- $branchDropdownCurrentRefType = "tag" -}}
-						{{template "repo/branch_dropdown" dict
+							{{- $branchDropdownCurrentRefShortName = .TagName -}}
+						{{- else if .IsViewCommit -}}
+							{{- /* for /owner/repo/src/commit/000000 */ -}}
+							{{- $branchDropdownCurrentRefType = "commit" -}}
+							{{- $branchDropdownCurrentRefShortName = ShortSha .CommitID -}}
+						{{- end -}}
+						{{- template "repo/branch_dropdown" dict
 							"Repository" .Repository
 							"ShowTabBranches" true
 							"ShowTabTags" true
@@ -40,7 +46,7 @@
 							"RefLinkTemplate" "{RepoLink}/src/{RefType}/{RefShortName}/{TreePath}"
 							"AllowCreateNewRef" .CanCreateBranch
 							"ShowViewAllRefsEntry" true
-						}}
+						-}}
 						{{if and .CanCompareOrPull .IsViewBranch (not .Repository.IsArchived)}}
 							{{$cmpBranch := ""}}
 							{{if ne .Repository.ID .BaseRepo.ID}}

templates/repo/home_sidebar_top.tmpl

@@ -62,6 +62,11 @@
 								{{svg "octicon-cross-reference"}} {{ctx.Locale.Tr "repo.cite_this_repo"}}
 							</a>
 						{{end}}
+						<span class="flex-text-block muted" {{if not (eq .Repository.Size 0)}}data-tooltip-placement="top" data-tooltip-content="{{.Repository.SizeDetailsString}}"{{end}}>
+							{{$fileSizeFormatted := FileSize .Repository.Size}}{{/* the formatted string is always "{val} {unit}" */}}
+							{{$fileSizeFields := StringUtils.Split $fileSizeFormatted " "}}
+							{{svg "octicon-database"}} <b>{{ctx.Locale.PrettyNumber (index $fileSizeFields 0)}}</b> {{index $fileSizeFields 1}}
+						</span>
 					</div>
 				</div>
 			</div>

templates/repo/issue/sidebar/assignee_list.tmpl

@@ -16,9 +16,9 @@
 				<input type="text" placeholder="{{ctx.Locale.Tr "repo.issues.filter_assignees"}}">
 			</div>
 			<div class="item clear-selection">{{ctx.Locale.Tr "repo.issues.new.clear_assignees"}}</div>
-			<div class="scrolling menu">
+			<div class="scrolling menu flex-items-block">
 				{{range $data.CandidateAssignees}}
-					<a class="item muted" href="#" data-value="{{.ID}}">
+					<a class="item" href="#" data-value="{{.ID}}">
 						<span class="item-check-mark">{{svg "octicon-check"}}</span>
 						{{ctx.AvatarUtils.Avatar . 20}} {{template "repo/search_name" .}}
 					</a>
@@ -26,10 +26,10 @@
 			</div>
 		</div>
 	</div>
-	<div class="ui list tw-flex tw-flex-row tw-gap-2">
+	<div class="ui list muted-links flex-items-block tw-flex tw-flex-col tw-gap-2">
 		<span class="item empty-list {{if $issueAssignees}}tw-hidden{{end}}">{{ctx.Locale.Tr "repo.issues.new.no_assignees"}}</span>
 		{{range $issueAssignees}}
-			<a class="item muted" href="{{$pageMeta.RepoLink}}/{{if $pageMeta.IsPullRequest}}pulls{{else}}issues{{end}}?assignee={{.ID}}">
+			<a class="item" href="{{$pageMeta.RepoLink}}/{{if $pageMeta.IsPullRequest}}pulls{{else}}issues{{end}}?assignee={{.ID}}">
 					{{ctx.AvatarUtils.Avatar . 20}} {{.GetDisplayName}}
 			</a>
 		{{end}}

templates/repo/sub_menu.tmpl

@@ -13,11 +13,6 @@
 					{{svg "octicon-tag"}} <b>{{ctx.Locale.PrettyNumber .NumTags}}</b> {{ctx.Locale.TrN .NumTags "repo.tag" "repo.tags"}}
 				</a>
 			{{end}}
-			<span class="item not-mobile" {{if not (eq .Repository.Size 0)}}data-tooltip-placement="top" data-tooltip-content="{{.Repository.SizeDetailsString}}"{{end}}>
-				{{$fileSizeFormatted := FileSize .Repository.Size}}{{/* the formatted string is always "{val} {unit}" */}}
-				{{$fileSizeFields := StringUtils.Split $fileSizeFormatted " "}}
-				{{svg "octicon-database"}} <b>{{ctx.Locale.PrettyNumber (index $fileSizeFields 0)}}</b> {{index $fileSizeFields 1}}
-			</span>
 		{{end}}
 	</div>
 </div>

templates/swagger/v1_json.tmpl

@@ -10867,6 +10867,52 @@
         }
       }
     },
+    "/repos/{owner}/{repo}/merge-upstream": {
+      "post": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Merge a branch from upstream",
+        "operationId": "repoMergeUpstream",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "name": "body",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/MergeUpstreamRequest"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/MergeUpstreamResponse"
+          },
+          "400": {
+            "$ref": "#/responses/error"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          }
+        }
+      }
+    },
     "/repos/{owner}/{repo}/milestones": {
       "get": {
         "produces": [
@@ -22827,6 +22873,26 @@
       "x-go-name": "MergePullRequestForm",
       "x-go-package": "code.gitea.io/gitea/services/forms"
     },
+    "MergeUpstreamRequest": {
+      "type": "object",
+      "properties": {
+        "branch": {
+          "type": "string",
+          "x-go-name": "Branch"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
+    "MergeUpstreamResponse": {
+      "type": "object",
+      "properties": {
+        "merge_type": {
+          "type": "string",
+          "x-go-name": "MergeStyle"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "MigrateRepoOptions": {
       "description": "MigrateRepoOptions options for migrating repository's\nthis is used to interact with api v1",
       "type": "object",
@@ -26008,6 +26074,18 @@
         "type": "string"
       }
     },
+    "MergeUpstreamRequest": {
+      "description": "",
+      "schema": {
+        "$ref": "#/definitions/MergeUpstreamRequest"
+      }
+    },
+    "MergeUpstreamResponse": {
+      "description": "",
+      "schema": {
+        "$ref": "#/definitions/MergeUpstreamResponse"
+      }
+    },
     "Milestone": {
       "description": "Milestone",
       "schema": {

tests/fuzz/fuzz_test.go

@@ -19,6 +19,7 @@ func newFuzzRenderContext() *markup.RenderContext {
 
 func FuzzMarkdownRenderRaw(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
+		setting.IsInTesting = true
 		setting.AppURL = "http://localhost:3000/"
 		markdown.RenderRaw(newFuzzRenderContext(), bytes.NewReader(data), io.Discard)
 	})
@@ -26,6 +27,7 @@ func FuzzMarkdownRenderRaw(f *testing.F) {
 
 func FuzzMarkupPostProcess(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
+		setting.IsInTesting = true
 		setting.AppURL = "http://localhost:3000/"
 		markup.PostProcessDefault(newFuzzRenderContext(), bytes.NewReader(data), io.Discard)
 	})

tests/integration/api_repo_get_contents_test.go

@@ -18,6 +18,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	repo_service "code.gitea.io/gitea/services/repository"
+	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -168,28 +169,37 @@ func testAPIGetContents(t *testing.T, u *url.URL) {
 }
 
 func TestAPIGetContentsRefFormats(t *testing.T) {
-	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+	defer tests.PrepareTestEnv(t)()
-		file := "README.md"
-		sha := "65f1bf27bc3bf70f64657658635e66094edbcb4d"
-		content := "# repo1\n\nDescription for repo1"
 
-		noRef := setting.AppURL + "api/v1/repos/user2/repo1/raw/" + file
+	file := "README.md"
-		refInPath := setting.AppURL + "api/v1/repos/user2/repo1/raw/" + sha + "/" + file
+	sha := "65f1bf27bc3bf70f64657658635e66094edbcb4d"
-		refInQuery := setting.AppURL + "api/v1/repos/user2/repo1/raw/" + file + "?ref=" + sha
+	content := "# repo1\n\nDescription for repo1"
 
-		resp := MakeRequest(t, NewRequest(t, http.MethodGet, noRef), http.StatusOK)
+	resp := MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/"+file), http.StatusOK)
-		raw, err := io.ReadAll(resp.Body)
+	raw, err := io.ReadAll(resp.Body)
-		assert.NoError(t, err)
+	assert.NoError(t, err)
-		assert.EqualValues(t, content, string(raw))
+	assert.EqualValues(t, content, string(raw))
 
-		resp = MakeRequest(t, NewRequest(t, http.MethodGet, refInPath), http.StatusOK)
+	resp = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/"+sha+"/"+file), http.StatusOK)
-		raw, err = io.ReadAll(resp.Body)
+	raw, err = io.ReadAll(resp.Body)
-		assert.NoError(t, err)
+	assert.NoError(t, err)
-		assert.EqualValues(t, content, string(raw))
+	assert.EqualValues(t, content, string(raw))
 
-		resp = MakeRequest(t, NewRequest(t, http.MethodGet, refInQuery), http.StatusOK)
+	resp = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/"+file+"?ref="+sha), http.StatusOK)
-		raw, err = io.ReadAll(resp.Body)
+	raw, err = io.ReadAll(resp.Body)
-		assert.NoError(t, err)
+	assert.NoError(t, err)
-		assert.EqualValues(t, content, string(raw))
+	assert.EqualValues(t, content, string(raw))
-	})
+
+	resp = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/"+file+"?ref=master"), http.StatusOK)
+	raw, err = io.ReadAll(resp.Body)
+	assert.NoError(t, err)
+	assert.EqualValues(t, content, string(raw))
+
+	_ = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/docs/README.md?ref=main"), http.StatusNotFound)
+	_ = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/README.md?ref=main"), http.StatusOK)
+	_ = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/docs/README.md?ref=sub-home-md-img-check"), http.StatusOK)
+	_ = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/README.md?ref=sub-home-md-img-check"), http.StatusNotFound)
+
+	// FIXME: this is an incorrect behavior, non-existing branch falls back to default branch
+	_ = MakeRequest(t, NewRequest(t, http.MethodGet, "/api/v1/repos/user2/repo1/raw/README.md?ref=no-such"), http.StatusOK)
 }

tests/integration/repo_merge_upstream_test.go

@@ -0,0 +1,122 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"testing"
+	"time"
+
+	auth_model "code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
+	git_model "code.gitea.io/gitea/models/git"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRepoMergeUpstream(t *testing.T) {
+	onGiteaRun(t, func(*testing.T, *url.URL) {
+		forkUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 4})
+
+		baseRepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+		baseUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: baseRepo.OwnerID})
+
+		checkFileContent := func(branch, exp string) {
+			req := NewRequest(t, "GET", fmt.Sprintf("/%s/test-repo-fork/raw/branch/%s/new-file.txt", forkUser.Name, branch))
+			resp := MakeRequest(t, req, http.StatusOK)
+			require.Equal(t, exp, resp.Body.String())
+		}
+
+		session := loginUser(t, forkUser.Name)
+		token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteRepository)
+
+		// create a fork
+		req := NewRequestWithJSON(t, "POST", fmt.Sprintf("/api/v1/repos/%s/%s/forks", baseUser.Name, baseRepo.Name), &api.CreateForkOption{
+			Name: util.ToPointer("test-repo-fork"),
+		}).AddTokenAuth(token)
+		MakeRequest(t, req, http.StatusAccepted)
+		forkRepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{OwnerID: forkUser.ID, Name: "test-repo-fork"})
+
+		// create fork-branch
+		req = NewRequestWithValues(t, "POST", fmt.Sprintf("/%s/test-repo-fork/branches/_new/branch/master", forkUser.Name), map[string]string{
+			"_csrf":           GetUserCSRFToken(t, session),
+			"new_branch_name": "fork-branch",
+		})
+		session.MakeRequest(t, req, http.StatusSeeOther)
+
+		queryMergeUpstreamButtonLink := func(htmlDoc *HTMLDoc) string {
+			return htmlDoc.Find(`button[data-url*="merge-upstream"]`).AttrOr("data-url", "")
+		}
+
+		t.Run("HeadBeforeBase", func(t *testing.T) {
+			// add a file in base repo
+			require.NoError(t, createOrReplaceFileInBranch(baseUser, baseRepo, "new-file.txt", "master", "test-content-1"))
+
+			// the repo shows a prompt to "sync fork"
+			var mergeUpstreamLink string
+			require.Eventually(t, func() bool {
+				resp := session.MakeRequest(t, NewRequestf(t, "GET", "/%s/test-repo-fork/src/branch/fork-branch", forkUser.Name), http.StatusOK)
+				htmlDoc := NewHTMLParser(t, resp.Body)
+				mergeUpstreamLink = queryMergeUpstreamButtonLink(htmlDoc)
+				if mergeUpstreamLink == "" {
+					return false
+				}
+				respMsg, _ := htmlDoc.Find(".ui.message:not(.positive)").Html()
+				return strings.Contains(respMsg, `This branch is 1 commit behind <a href="/user2/repo1/src/branch/master">user2/repo1:master</a>`)
+			}, 5*time.Second, 100*time.Millisecond)
+
+			// click the "sync fork" button
+			req = NewRequestWithValues(t, "POST", mergeUpstreamLink, map[string]string{"_csrf": GetUserCSRFToken(t, session)})
+			session.MakeRequest(t, req, http.StatusOK)
+			checkFileContent("fork-branch", "test-content-1")
+		})
+
+		t.Run("BaseChangeAfterHeadChange", func(t *testing.T) {
+			// update the files: base first, head later, and check the prompt
+			require.NoError(t, createOrReplaceFileInBranch(baseUser, baseRepo, "new-file.txt", "master", "test-content-2"))
+			require.NoError(t, createOrReplaceFileInBranch(forkUser, forkRepo, "new-file-other.txt", "fork-branch", "test-content-other"))
+
+			// make sure the base branch's update time is before the fork, to make it test the complete logic
+			baseBranch := unittest.AssertExistsAndLoadBean(t, &git_model.Branch{RepoID: baseRepo.ID, Name: "master"})
+			forkBranch := unittest.AssertExistsAndLoadBean(t, &git_model.Branch{RepoID: forkRepo.ID, Name: "fork-branch"})
+			_, err := db.GetEngine(db.DefaultContext).ID(forkBranch.ID).Update(&git_model.Branch{UpdatedUnix: baseBranch.UpdatedUnix + 1})
+			require.NoError(t, err)
+
+			// the repo shows a prompt to "sync fork"
+			require.Eventually(t, func() bool {
+				resp := session.MakeRequest(t, NewRequestf(t, "GET", "/%s/test-repo-fork/src/branch/fork-branch", forkUser.Name), http.StatusOK)
+				htmlDoc := NewHTMLParser(t, resp.Body)
+				respMsg, _ := htmlDoc.Find(".ui.message:not(.positive)").Html()
+				return strings.Contains(respMsg, `The base branch <a href="/user2/repo1/src/branch/master">user2/repo1:master</a> has new changes`)
+			}, 5*time.Second, 100*time.Millisecond)
+
+			// and do the merge-upstream by API
+			req = NewRequestWithJSON(t, "POST", fmt.Sprintf("/api/v1/repos/%s/test-repo-fork/merge-upstream", forkUser.Name), &api.MergeUpstreamRequest{
+				Branch: "fork-branch",
+			}).AddTokenAuth(token)
+			resp := MakeRequest(t, req, http.StatusOK)
+			checkFileContent("fork-branch", "test-content-2")
+
+			var mergeResp api.MergeUpstreamResponse
+			DecodeJSON(t, resp, &mergeResp)
+			assert.Equal(t, "merge", mergeResp.MergeStyle)
+
+			// after merge, there should be no "sync fork" button anymore
+			require.Eventually(t, func() bool {
+				resp := session.MakeRequest(t, NewRequestf(t, "GET", "/%s/test-repo-fork/src/branch/fork-branch", forkUser.Name), http.StatusOK)
+				htmlDoc := NewHTMLParser(t, resp.Body)
+				return queryMergeUpstreamButtonLink(htmlDoc) == ""
+			}, 5*time.Second, 100*time.Millisecond)
+		})
+	})
+}

web_src/js/features/comp/EditorMarkdown.test.ts

@@ -1,4 +1,166 @@
-import {initTextareaMarkdown} from './EditorMarkdown.ts';
+import {initTextareaMarkdown, markdownHandleIndention, textareaSplitLines} from './EditorMarkdown.ts';
+
+test('textareaSplitLines', () => {
+  let ret = textareaSplitLines('a\nbc\nd', 0);
+  expect(ret).toEqual({lines: ['a', 'bc', 'd'], lengthBeforePosLine: 0, posLineIndex: 0, inlinePos: 0});
+
+  ret = textareaSplitLines('a\nbc\nd', 1);
+  expect(ret).toEqual({lines: ['a', 'bc', 'd'], lengthBeforePosLine: 0, posLineIndex: 0, inlinePos: 1});
+
+  ret = textareaSplitLines('a\nbc\nd', 2);
+  expect(ret).toEqual({lines: ['a', 'bc', 'd'], lengthBeforePosLine: 2, posLineIndex: 1, inlinePos: 0});
+
+  ret = textareaSplitLines('a\nbc\nd', 3);
+  expect(ret).toEqual({lines: ['a', 'bc', 'd'], lengthBeforePosLine: 2, posLineIndex: 1, inlinePos: 1});
+
+  ret = textareaSplitLines('a\nbc\nd', 4);
+  expect(ret).toEqual({lines: ['a', 'bc', 'd'], lengthBeforePosLine: 2, posLineIndex: 1, inlinePos: 2});
+
+  ret = textareaSplitLines('a\nbc\nd', 5);
+  expect(ret).toEqual({lines: ['a', 'bc', 'd'], lengthBeforePosLine: 5, posLineIndex: 2, inlinePos: 0});
+
+  ret = textareaSplitLines('a\nbc\nd', 6);
+  expect(ret).toEqual({lines: ['a', 'bc', 'd'], lengthBeforePosLine: 5, posLineIndex: 2, inlinePos: 1});
+});
+
+test('markdownHandleIndention', () => {
+  const testInput = (input: string, expected?: string) => {
+    const inputPos = input.indexOf('|');
+    input = input.replace('|', '');
+    const ret = markdownHandleIndention({value: input, selStart: inputPos, selEnd: inputPos});
+    if (expected === null) {
+      expect(ret).toEqual({handled: false});
+    } else {
+      const expectedPos = expected.indexOf('|');
+      expected = expected.replace('|', '');
+      expect(ret).toEqual({
+        handled: true,
+        valueSelection: {value: expected, selStart: expectedPos, selEnd: expectedPos},
+      });
+    }
+  };
+
+  testInput(`
+  a|b
+`, `
+  a
+  |b
+`);
+
+  testInput(`
+1. a
+2. |
+`, `
+1. a
+|
+`);
+
+  testInput(`
+|1. a
+`, null); // let browser handle it
+
+  testInput(`
+1. a
+1. b|c
+`, `
+1. a
+2. b
+3. |c
+`);
+
+  testInput(`
+2. a
+2. b|
+
+1. x
+1. y
+`, `
+1. a
+2. b
+3. |
+
+1. x
+1. y
+`);
+
+  testInput(`
+2. a
+2. b
+
+1. x|
+1. y
+`, `
+2. a
+2. b
+
+1. x
+2. |
+3. y
+`);
+
+  testInput(`
+1. a
+2. b|
+3. c
+`, `
+1. a
+2. b
+3. |
+4. c
+`);
+
+  testInput(`
+1. a
+  1. b
+  2. b
+  3. b
+  4. b
+1. c|
+`, `
+1. a
+  1. b
+  2. b
+  3. b
+  4. b
+2. c
+3. |
+`);
+
+  testInput(`
+1. a
+2. a
+3. a
+4. a
+5. a
+6. a
+7. a
+8. a
+9. b|c
+`, `
+1. a
+2. a
+3. a
+4. a
+5. a
+6. a
+7. a
+8. a
+9. b
+10. |c
+`);
+
+  // this is a special case, it's difficult to re-format the parent level at the moment, so leave it to the future
+  testInput(`
+1. a
+  2. b|
+3. c
+`, `
+1. a
+  1. b
+  2. |
+3. c
+`);
+});
 
 test('EditorMarkdown', () => {
   const textarea = document.createElement('textarea');
@@ -32,10 +194,10 @@ test('EditorMarkdown', () => {
   testInput({value: '1. \n2. ', pos: 3}, {value: '\n2. ', pos: 0});
 
   testInput('- x', '- x\n- ');
-  testInput('1. foo', '1. foo\n1. ');
+  testInput('1. foo', '1. foo\n2. ');
-  testInput({value: '1. a\n2. b\n3. c', pos: 4}, {value: '1. a\n1. \n2. b\n3. c', pos: 8});
+  testInput({value: '1. a\n2. b\n3. c', pos: 4}, {value: '1. a\n2. \n3. b\n4. c', pos: 8});
   testInput('- [ ]', '- [ ]\n- ');
   testInput('- [ ] foo', '- [ ] foo\n- [ ] ');
   testInput('* [x] foo', '* [x] foo\n* [ ] ');
-  testInput('1. [x] foo', '1. [x] foo\n1. [ ] ');
+  testInput('1. [x] foo', '1. [x] foo\n2. [ ] ');
 });

web_src/js/features/comp/EditorMarkdown.ts

@@ -14,7 +14,13 @@ export function textareaInsertText(textarea, value) {
   triggerEditorContentChanged(textarea);
 }
 
-function handleIndentSelection(textarea, e) {
+type TextareaValueSelection = {
+  value: string;
+  selStart: number;
+  selEnd: number;
+}
+
+function handleIndentSelection(textarea: HTMLTextAreaElement, e) {
   const selStart = textarea.selectionStart;
   const selEnd = textarea.selectionEnd;
   if (selEnd === selStart) return; // do not process when no selection
@@ -56,53 +62,125 @@ function handleIndentSelection(textarea, e) {
   triggerEditorContentChanged(textarea);
 }
 
-function handleNewline(textarea: HTMLTextAreaElement, e: Event) {
+type MarkdownHandleIndentionResult = {
-  const selStart = textarea.selectionStart;
+  handled: boolean;
-  const selEnd = textarea.selectionEnd;
+  valueSelection?: TextareaValueSelection;
-  if (selEnd !== selStart) return; // do not process when there is a selection
+}
 
-  const value = textarea.value;
+type TextLinesBuffer = {
+  lines: string[];
+  lengthBeforePosLine: number;
+  posLineIndex: number;
+  inlinePos: number
+}
 
-  // find the current line
+export function textareaSplitLines(value: string, pos: number): TextLinesBuffer {
-  // * if selStart is 0, lastIndexOf(..., -1) is the same as lastIndexOf(..., 0)
+  const lines = value.split('\n');
-  // * if lastIndexOf reruns -1, lineStart is 0 and it is still correct.
+  let lengthBeforePosLine = 0, inlinePos = 0, posLineIndex = 0;
-  const lineStart = value.lastIndexOf('\n', selStart - 1) + 1;
+  for (; posLineIndex < lines.length; posLineIndex++) {
-  let lineEnd = value.indexOf('\n', selStart);
+    const lineLength = lines[posLineIndex].length + 1;
-  lineEnd = lineEnd < 0 ? value.length : lineEnd;
+    if (lengthBeforePosLine + lineLength > pos) {
-  let line = value.slice(lineStart, lineEnd);
+      inlinePos = pos - lengthBeforePosLine;
-  if (!line) return; // if the line is empty, do nothing, let the browser handle it
+      break;
+    }
+    lengthBeforePosLine += lineLength;
+  }
+  return {lines, lengthBeforePosLine, posLineIndex, inlinePos};
+}
+
+function markdownReformatListNumbers(linesBuf: TextLinesBuffer, indention: string) {
+  const reDeeperIndention = new RegExp(`^${indention}\\s+`);
+  const reSameLevel = new RegExp(`^${indention}([0-9]+)\\.`);
+  let firstLineIdx: number;
+  for (firstLineIdx = linesBuf.posLineIndex - 1; firstLineIdx >= 0; firstLineIdx--) {
+    const line = linesBuf.lines[firstLineIdx];
+    if (!reDeeperIndention.test(line) && !reSameLevel.test(line)) break;
+  }
+  firstLineIdx++;
+  let num = 1;
+  for (let i = firstLineIdx; i < linesBuf.lines.length; i++) {
+    const oldLine = linesBuf.lines[i];
+    const sameLevel = reSameLevel.test(oldLine);
+    if (!sameLevel && !reDeeperIndention.test(oldLine)) break;
+    if (sameLevel) {
+      const newLine = `${indention}${num}.${oldLine.replace(reSameLevel, '')}`;
+      linesBuf.lines[i] = newLine;
+      num++;
+      if (linesBuf.posLineIndex === i) {
+        // need to correct the cursor inline position if the line length changes
+        linesBuf.inlinePos += newLine.length - oldLine.length;
+        linesBuf.inlinePos = Math.max(0, linesBuf.inlinePos);
+        linesBuf.inlinePos = Math.min(newLine.length, linesBuf.inlinePos);
+      }
+    }
+  }
+  recalculateLengthBeforeLine(linesBuf);
+}
+
+function recalculateLengthBeforeLine(linesBuf: TextLinesBuffer) {
+  linesBuf.lengthBeforePosLine = 0;
+  for (let i = 0; i < linesBuf.posLineIndex; i++) {
+    linesBuf.lengthBeforePosLine += linesBuf.lines[i].length + 1;
+  }
+}
+
+export function markdownHandleIndention(tvs: TextareaValueSelection): MarkdownHandleIndentionResult {
+  const unhandled: MarkdownHandleIndentionResult = {handled: false};
+  if (tvs.selEnd !== tvs.selStart) return unhandled; // do not process when there is a selection
+
+  const linesBuf = textareaSplitLines(tvs.value, tvs.selStart);
+  const line = linesBuf.lines[linesBuf.posLineIndex] ?? '';
+  if (!line) return unhandled; // if the line is empty, do nothing, let the browser handle it
 
   // parse the indention
-  const indention = /^\s*/.exec(line)[0];
+  let lineContent = line;
-  line = line.slice(indention.length);
+  const indention = /^\s*/.exec(lineContent)[0];
+  lineContent = lineContent.slice(indention.length);
+  if (linesBuf.inlinePos <= indention.length) return unhandled; // if cursor is at the indention, do nothing, let the browser handle it
 
   // parse the prefixes: "1. ", "- ", "* ", there could also be " [ ] " or " [x] " for task lists
   // there must be a space after the prefix because none of "1.foo" / "-foo" is a list item
-  const prefixMatch = /^([0-9]+\.|[-*])(\s\[([ x])\])?\s/.exec(line);
+  const prefixMatch = /^([0-9]+\.|[-*])(\s\[([ x])\])?\s/.exec(lineContent);
   let prefix = '';
   if (prefixMatch) {
     prefix = prefixMatch[0];
-    if (lineStart + prefix.length > selStart) prefix = ''; // do not add new line if cursor is at prefix
+    if (prefix.length > linesBuf.inlinePos) prefix = ''; // do not add new line if cursor is at prefix
   }
 
-  line = line.slice(prefix.length);
+  lineContent = lineContent.slice(prefix.length);
-  if (!indention && !prefix) return; // if no indention and no prefix, do nothing, let the browser handle it
+  if (!indention && !prefix) return unhandled; // if no indention and no prefix, do nothing, let the browser handle it
 
-  e.preventDefault();
+  if (!lineContent) {
-  if (!line) {
     // clear current line if we only have i.e. '1. ' and the user presses enter again to finish creating a list
-    textarea.value = value.slice(0, lineStart) + value.slice(lineEnd);
+    linesBuf.lines[linesBuf.posLineIndex] = '';
-    textarea.setSelectionRange(selStart - prefix.length, selStart - prefix.length);
+    linesBuf.inlinePos = 0;
   } else {
-    // start a new line with the same indention and prefix
+    // start a new line with the same indention
     let newPrefix = prefix;
-    // a simple approach, otherwise it needs to parse the lines after the current line
     if (/^\d+\./.test(prefix)) newPrefix = `1. ${newPrefix.slice(newPrefix.indexOf('.') + 2)}`;
     newPrefix = newPrefix.replace('[x]', '[ ]');
-    const newLine = `\n${indention}${newPrefix}`;
+
-    textarea.value = value.slice(0, selStart) + newLine + value.slice(selEnd);
+    const inlinePos = linesBuf.inlinePos;
-    textarea.setSelectionRange(selStart + newLine.length, selStart + newLine.length);
+    linesBuf.lines[linesBuf.posLineIndex] = line.substring(0, inlinePos);
+    const newLineLeft = `${indention}${newPrefix}`;
+    const newLine = `${newLineLeft}${line.substring(inlinePos)}`;
+    linesBuf.lines.splice(linesBuf.posLineIndex + 1, 0, newLine);
+    linesBuf.posLineIndex++;
+    linesBuf.inlinePos = newLineLeft.length;
+    recalculateLengthBeforeLine(linesBuf);
   }
+
+  markdownReformatListNumbers(linesBuf, indention);
+  const newPos = linesBuf.lengthBeforePosLine + linesBuf.inlinePos;
+  return {handled: true, valueSelection: {value: linesBuf.lines.join('\n'), selStart: newPos, selEnd: newPos}};
+}
+
+function handleNewline(textarea: HTMLTextAreaElement, e: Event) {
+  const ret = markdownHandleIndention({value: textarea.value, selStart: textarea.selectionStart, selEnd: textarea.selectionEnd});
+  if (!ret.handled) return;
+  e.preventDefault();
+  textarea.value = ret.valueSelection.value;
+  textarea.setSelectionRange(ret.valueSelection.selStart, ret.valueSelection.selEnd);
   triggerEditorContentChanged(textarea);
 }