Introduce GitHub markdown editor, keep EasyMDE as fallback (#23876)

The first step of the plan

* #23290

Thanks to @silverwind for the first try in #15394 . Close #10729 and a
lot of related issues.

The EasyMDE is not removed, now it works as a fallback, users can switch
between these two editors.

Editor list:

* Issue / PR comment
* Issue / PR comment edit
* Issue / PR comment quote reply
* PR diff view, inline comment
* PR diff view, inline comment edit
* PR diff view, inline comment quote reply
* Release editor
* Wiki editor

Some editors have attached dropzone

Screenshots:

<details>


![image](https://user-images.githubusercontent.com/2114189/229363558-7e44dcd4-fb6d-48a0-92f8-bd12f57bb0a0.png)


![image](https://user-images.githubusercontent.com/2114189/229363566-781489c8-5306-4347-9714-d71af5d5b0b1.png)


![image](https://user-images.githubusercontent.com/2114189/229363771-1717bf5c-0f2a-4fc2-ba84-4f5b2a343a11.png)


![image](https://user-images.githubusercontent.com/2114189/229363793-ad362d0f-a045-47bd-8f9d-05a9a842bb39.png)

</details>

---------

Co-authored-by: silverwind <me@silverwind.io>

11 files changed, 42 insertions, 32 deletions

diff --git a/routers/web/devtest/devtest.go b/routers/web/devtest/devtest.go
new file mode 100644
index 0000000000..eb77d0b927
--- /dev/null
+++ b/routers/web/devtest/devtest.go
@@ -0,0 +1,35 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package devtest
+
+import (
+	"net/http"
+	"path"
+	"strings"
+
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/templates"
+)
+
+// List all devtest templates, they will be used for e2e tests for the UI components
+func List(ctx *context.Context) {
+	templateNames := templates.GetTemplateAssetNames()
+	var subNames []string
+	const prefix = "templates/devtest/"
+	for _, tmplName := range templateNames {
+		if strings.HasPrefix(tmplName, prefix) {
+			subName := strings.TrimSuffix(strings.TrimPrefix(tmplName, prefix), ".tmpl")
+			if subName != "list" {
+				subNames = append(subNames, subName)
+			}
+		}
+	}
+	ctx.Data["SubNames"] = subNames
+	ctx.HTML(http.StatusOK, "devtest/list")
+}
+
+func Tmpl(ctx *context.Context) {
+	ctx.HTML(http.StatusOK, base.TplName("devtest"+path.Clean("/"+ctx.Params("sub"))))
+}
diff --git a/routers/web/misc/markup.go b/routers/web/misc/markup.go
index f678316f44..1690378945 100644
--- a/routers/web/misc/markup.go
+++ b/routers/web/misc/markup.go
@@ -15,24 +15,6 @@ import (
 
 // Markup render markup document to HTML
 func Markup(ctx *context.Context) {
-	// swagger:operation POST /markup miscellaneous renderMarkup
-	// ---
-	// summary: Render a markup document as HTML
-	// parameters:
-	// - name: body
-	//   in: body
-	//   schema:
-	//     "$ref": "#/definitions/MarkupOption"
-	// consumes:
-	// - application/json
-	// produces:
-	//     - text/html
-	// responses:
-	//   "200":
-	//     "$ref": "#/responses/MarkupRender"
-	//   "422":
-	//     "$ref": "#/responses/validationError"
-
 	form := web.GetForm(ctx).(*api.MarkupOption)
 
 	if ctx.HasAPIError() {
diff --git a/routers/web/org/setting.go b/routers/web/org/setting.go
index 654e9000fa..7d84c101d8 100644
--- a/routers/web/org/setting.go
+++ b/routers/web/org/setting.go
@@ -246,7 +246,6 @@ func Labels(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.labels")
 	ctx.Data["PageIsOrgSettings"] = true
 	ctx.Data["PageIsOrgSettingsLabels"] = true
-	ctx.Data["RequireTribute"] = true
 	ctx.Data["LabelTemplates"] = repo_module.LabelTemplates
 	ctx.HTML(http.StatusOK, tplSettingsLabels)
 }
diff --git a/routers/web/repo/commit.go b/routers/web/repo/commit.go
index 843b1d8dfd..7439c2411b 100644
--- a/routers/web/repo/commit.go
+++ b/routers/web/repo/commit.go
@@ -253,7 +253,6 @@ func FileHistory(ctx *context.Context) {
 // Diff show different from current commit to previous commit
 func Diff(ctx *context.Context) {
 	ctx.Data["PageIsDiff"] = true
-	ctx.Data["RequireTribute"] = true
 
 	userName := ctx.Repo.Owner.Name
 	repoName := ctx.Repo.Repository.Name
diff --git a/routers/web/repo/compare.go b/routers/web/repo/compare.go
index d7e7bac7b7..c49eb762d8 100644
--- a/routers/web/repo/compare.go
+++ b/routers/web/repo/compare.go
@@ -781,7 +781,6 @@ func CompareDiff(ctx *context.Context) {
 
 	ctx.Data["IsRepoToolbarCommits"] = true
 	ctx.Data["IsDiffCompare"] = true
-	ctx.Data["RequireTribute"] = true
 	templateErrs := setTemplateIfExists(ctx, pullRequestTemplateKey, pullRequestTemplateCandidates)
 
 	if len(templateErrs) > 0 {
diff --git a/routers/web/repo/editor.go b/routers/web/repo/editor.go
index 2b66be22ae..f65e1ad3d8 100644
--- a/routers/web/repo/editor.go
+++ b/routers/web/repo/editor.go
@@ -538,7 +538,6 @@ func DeleteFilePost(ctx *context.Context) {
 // UploadFile render upload file page
 func UploadFile(ctx *context.Context) {
 	ctx.Data["PageIsUpload"] = true
-	ctx.Data["RequireTribute"] = true
 	upload.AddUploadContext(ctx, "repo")
 	canCommit := renderCommitRights(ctx)
 	treePath := cleanUploadFileName(ctx.Repo.TreePath)
@@ -573,7 +572,6 @@ func UploadFile(ctx *context.Context) {
 func UploadFilePost(ctx *context.Context) {
 	form := web.GetForm(ctx).(*forms.UploadRepoFileForm)
 	ctx.Data["PageIsUpload"] = true
-	ctx.Data["RequireTribute"] = true
 	upload.AddUploadContext(ctx, "repo")
 	canCommit := renderCommitRights(ctx)
 
diff --git a/routers/web/repo/issue.go b/routers/web/repo/issue.go
index 612222598f..e4f1172dd9 100644
--- a/routers/web/repo/issue.go
+++ b/routers/web/repo/issue.go
@@ -849,7 +849,6 @@ func NewIssue(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.issues.new")
 	ctx.Data["PageIsIssueList"] = true
 	ctx.Data["NewIssueChooseTemplate"] = ctx.HasIssueTemplatesOrContactLinks()
-	ctx.Data["RequireTribute"] = true
 	ctx.Data["PullRequestWorkInProgressPrefixes"] = setting.Repository.PullRequest.WorkInProgressPrefixes
 	title := ctx.FormString("title")
 	ctx.Data["TitleQuery"] = title
@@ -1295,7 +1294,6 @@ func ViewIssue(ctx *context.Context) {
 		ctx.Data["IssueType"] = "all"
 	}
 
-	ctx.Data["RequireTribute"] = true
 	ctx.Data["IsProjectsEnabled"] = ctx.Repo.CanRead(unit.TypeProjects)
 	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
 	upload.AddUploadContext(ctx, "comment")
diff --git a/routers/web/repo/issue_label.go b/routers/web/repo/issue_label.go
index 31bf85fedb..3123359a65 100644
--- a/routers/web/repo/issue_label.go
+++ b/routers/web/repo/issue_label.go
@@ -28,7 +28,6 @@ func Labels(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.labels")
 	ctx.Data["PageIsIssueList"] = true
 	ctx.Data["PageIsLabels"] = true
-	ctx.Data["RequireTribute"] = true
 	ctx.Data["LabelTemplates"] = repo_module.LabelTemplates
 	ctx.HTML(http.StatusOK, tplLabels)
 }
diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index 4f99687738..c37d52640f 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -791,7 +791,6 @@ func ViewPullFiles(ctx *context.Context) {
 
 	setCompareContext(ctx, baseCommit, commit, ctx.Repo.Owner.Name, ctx.Repo.Repository.Name)
 
-	ctx.Data["RequireTribute"] = true
 	if ctx.Data["Assignees"], err = repo_model.GetRepoAssignees(ctx, ctx.Repo.Repository); err != nil {
 		ctx.ServerError("GetAssignees", err)
 		return
@@ -1160,7 +1159,6 @@ func CompareAndPullRequestPost(ctx *context.Context) {
 	ctx.Data["PageIsComparePull"] = true
 	ctx.Data["IsDiffCompare"] = true
 	ctx.Data["IsRepoToolbarCommits"] = true
-	ctx.Data["RequireTribute"] = true
 	ctx.Data["PullRequestWorkInProgressPrefixes"] = setting.Repository.PullRequest.WorkInProgressPrefixes
 	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
 	upload.AddUploadContext(ctx, "comment")
diff --git a/routers/web/repo/release.go b/routers/web/repo/release.go
index 3ffadd34ac..b8c5f67f45 100644
--- a/routers/web/repo/release.go
+++ b/routers/web/repo/release.go
@@ -308,7 +308,6 @@ func LatestRelease(ctx *context.Context) {
 func NewRelease(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.release.new_release")
 	ctx.Data["PageIsReleaseList"] = true
-	ctx.Data["RequireTribute"] = true
 	ctx.Data["tag_target"] = ctx.Repo.Repository.DefaultBranch
 	if tagName := ctx.FormString("tag"); len(tagName) > 0 {
 		rel, err := repo_model.GetRelease(ctx.Repo.Repository.ID, tagName)
@@ -351,7 +350,6 @@ func NewReleasePost(ctx *context.Context) {
 	form := web.GetForm(ctx).(*forms.NewReleaseForm)
 	ctx.Data["Title"] = ctx.Tr("repo.release.new_release")
 	ctx.Data["PageIsReleaseList"] = true
-	ctx.Data["RequireTribute"] = true
 
 	if ctx.HasError() {
 		ctx.HTML(http.StatusOK, tplReleaseNew)
@@ -469,7 +467,6 @@ func EditRelease(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.release.edit_release")
 	ctx.Data["PageIsReleaseList"] = true
 	ctx.Data["PageIsEditRelease"] = true
-	ctx.Data["RequireTribute"] = true
 	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
 	upload.AddUploadContext(ctx, "release")
 
@@ -514,7 +511,6 @@ func EditReleasePost(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.release.edit_release")
 	ctx.Data["PageIsReleaseList"] = true
 	ctx.Data["PageIsEditRelease"] = true
-	ctx.Data["RequireTribute"] = true
 
 	tagName := ctx.Params("*")
 	rel, err := repo_model.GetRelease(ctx.Repo.Repository.ID, tagName)
diff --git a/routers/web/web.go b/routers/web/web.go
index 4bd2f76c57..6b62ff6f83 100644
--- a/routers/web/web.go
+++ b/routers/web/web.go
@@ -27,6 +27,7 @@ import (
 	"code.gitea.io/gitea/modules/web/routing"
 	"code.gitea.io/gitea/routers/web/admin"
 	"code.gitea.io/gitea/routers/web/auth"
+	"code.gitea.io/gitea/routers/web/devtest"
 	"code.gitea.io/gitea/routers/web/events"
 	"code.gitea.io/gitea/routers/web/explore"
 	"code.gitea.io/gitea/routers/web/feed"
@@ -1491,6 +1492,12 @@ func RegisterRoutes(m *web.Route) {
 	if setting.API.EnableSwagger {
 		m.Get("/swagger.v1.json", SwaggerV1Json)
 	}
+
+	if !setting.IsProd {
+		m.Any("/devtest", devtest.List)
+		m.Any("/devtest/{sub}", devtest.Tmpl)
+	}
+
 	m.NotFound(func(w http.ResponseWriter, req *http.Request) {
 		ctx := context.GetContext(req)
 		ctx.NotFound("", nil)