feat: use combo markdown editor for milestone description

- Use the combo markdown editor for the milestone description. The
milestone description is rendered in markdown, so it makes sense to use
a 'markdown-aware' editor. This also includes the option to use
monospace font.
- Resolves #5649

templates/repo/issue/milestone_new.tmpl

@@ -35,8 +35,15 @@
 					<input type="date" id="deadline" name="deadline" value="{{.deadline}}" placeholder="{{ctx.Locale.Tr "repo.issues.due_date_form"}}">
 				</div>
 				<div class="field">
-					<label>{{ctx.Locale.Tr "repo.milestones.desc"}}</label>
+					{{template "shared/combomarkdowneditor" (dict
-					<textarea name="content">{{.content}}</textarea>
+						"MarkdownPreviewUrl" (print .Repository.Link "/markup")
+						"MarkdownPreviewContext" .RepoLink
+						"TextareaName" "content"
+						"TextareaPlaceholder" (ctx.Locale.Tr "repo.milestones.desc")
+						"TextareaAriaLabel" (ctx.Locale.Tr "repo.milestones.desc")
+						"TextareaContent" .content
+						"EasyMDE" true
+					)}}
 				</div>
 				<div class="divider"></div>
 				<div class="tw-text-right">

tests/integration/easymde_test.go

@@ -14,6 +14,8 @@ func TestEasyMDESwitch(t *testing.T) {
 	testEasyMDESwitch(t, session, "user2/glob/issues/new", false)
 	testEasyMDESwitch(t, session, "user2/glob/wiki?action=_new", true)
 	testEasyMDESwitch(t, session, "user2/glob/releases/new", true)
+	testEasyMDESwitch(t, session, "user2/glob/milestones/new", true)
+	testEasyMDESwitch(t, session, "user2/repo1/milestones/1/edit", true)
 }
 
 func testEasyMDESwitch(t *testing.T, session *TestSession, url string, expected bool) {

web_src/js/features/repo-milestone.js

@@ -0,0 +1,9 @@
+import {initComboMarkdownEditor} from './comp/ComboMarkdownEditor.js';
+
+export function initRepoMilestoneEditor() {
+  const editor = document.querySelector('.page-content.repository.milestone .combo-markdown-editor');
+  if (!editor) {
+    return;
+  }
+  initComboMarkdownEditor(editor);
+}

web_src/js/index.js

@@ -86,6 +86,7 @@ import {initRepoDiffCommitBranchesAndTags} from './features/repo-diff-commit.js'
 import {initDirAuto} from './modules/dirauto.js';
 import {initRepositorySearch} from './features/repo-search.js';
 import {initColorPickers} from './features/colorpicker.js';
+import {initRepoMilestoneEditor} from './features/repo-milestone.js';
 
 // Init Gitea's Fomantic settings
 initGiteaFomantic();
@@ -175,6 +176,7 @@ onDomReady(() => {
   initRepoContributors();
   initRepoCodeFrequency();
   initRepoRecentCommits();
+  initRepoMilestoneEditor();
 
   initCommitStatuses();
   initCaptcha();