Fix duplicate dropdown dividers (#32760)

Fix #27466

The problem is that any item in the menu could be hidden, pure CSS won't
work, and dropdown's builtin "hideDividers" doesn't work with our "scope
dividers". The newly introduced "archived" label makes the dividers
regression more.

.eslintrc.yaml

@@ -818,7 +818,7 @@ rules:
   unicorn/consistent-destructuring: [2]
   unicorn/consistent-empty-array-spread: [2]
   unicorn/consistent-existence-index-check: [0]
-  unicorn/consistent-function-scoping: [2]
+  unicorn/consistent-function-scoping: [0]
   unicorn/custom-error-definition: [0]
   unicorn/empty-brace-spaces: [2]
   unicorn/error-message: [0]

modules/templates/helper.go

@@ -294,9 +294,7 @@ func timeEstimateString(timeSec any) string {
 	return util.TimeEstimateString(v)
 }
 
-type QueryString string
-
-func queryBuild(a ...any) QueryString {
+func queryBuild(a ...any) template.URL {
 	var s string
 	if len(a)%2 == 1 {
 		if v, ok := a[0].(string); ok {
@@ -304,7 +302,7 @@ func queryBuild(a ...any) QueryString {
 				panic("queryBuild: invalid argument")
 			}
 			s = v
-		} else if v, ok := a[0].(QueryString); ok {
+		} else if v, ok := a[0].(template.URL); ok {
 			s = string(v)
 		} else {
 			panic("queryBuild: invalid argument")
@@ -356,7 +354,7 @@ func queryBuild(a ...any) QueryString {
 	if s != "" && s != "&" && s[len(s)-1] == '&' {
 		s = s[:len(s)-1]
 	}
-	return QueryString(s)
+	return template.URL(s)
 }
 
 func panicIfDevOrTesting() {

templates/projects/view.tmpl

@@ -36,10 +36,11 @@
 							{{range .Labels}}
 								{{$exclusiveScope := .ExclusiveScope}}
 								{{if and (ne $previousExclusiveScope $exclusiveScope)}}
-									<div class="divider"></div>
+									<div class="divider" data-scope="{{.ExclusiveScope}}"></div>
 								{{end}}
 								{{$previousExclusiveScope = $exclusiveScope}}
-								<a class="item label-filter-item tw-flex tw-items-center" {{if .IsArchived}}data-is-archived{{end}} href="?labels={{.QueryString}}&assignee={{$.AssigneeID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}" data-label-id="{{.ID}}">
+								<a class="item label-filter-item tw-flex tw-items-center" data-label-id="{{.ID}}" data-scope="{{.ExclusiveScope}}" {{if .IsArchived}}data-is-archived{{end}}
+									href="?labels={{.QueryString}}&assignee={{$.AssigneeID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}">
 									{{if .IsExcluded}}
 										{{svg "octicon-circle-slash"}}
 									{{else if .IsSelected}}

templates/repo/issue/filter_list.tmpl

@@ -30,10 +30,11 @@
 		{{range .Labels}}
 			{{$exclusiveScope := .ExclusiveScope}}
 			{{if and (ne $previousExclusiveScope $exclusiveScope)}}
-				<div class="divider"></div>
+				<div class="divider" data-scope="{{.ExclusiveScope}}"></div>
 			{{end}}
 			{{$previousExclusiveScope = $exclusiveScope}}
-			<a class="item label-filter-item tw-flex tw-items-center" {{if .IsArchived}}data-is-archived{{end}} href="{{QueryBuild $queryLink "labels" .QueryString}}" data-label-id="{{.ID}}">
+			<a class="item label-filter-item tw-flex tw-items-center" data-label-id="{{.ID}}" data-scope="{{.ExclusiveScope}}" {{if .IsArchived}}data-is-archived{{end}}
+				href="{{QueryBuild $queryLink "labels" .QueryString}}">
 				{{if .IsExcluded}}
 					{{svg "octicon-circle-slash"}}
 				{{else if .IsSelected}}

templates/repo/issue/sidebar/label_list.tmpl

@@ -22,7 +22,7 @@
 					{{range $data.RepoLabels}}
 						{{$exclusiveScope := .ExclusiveScope}}
 						{{if and (ne $previousExclusiveScope "_no_scope") (ne $previousExclusiveScope $exclusiveScope)}}
-							<div class="divider"></div>
+							<div class="divider" data-scope="{{.ExclusiveScope}}"></div>
 						{{end}}
 						{{$previousExclusiveScope = $exclusiveScope}}
 						{{template "repo/issue/sidebar/label_list_item" dict "Label" .}}
@@ -32,7 +32,7 @@
 					{{range $data.OrgLabels}}
 						{{$exclusiveScope := .ExclusiveScope}}
 						{{if and (ne $previousExclusiveScope "_no_scope") (ne $previousExclusiveScope $exclusiveScope)}}
-							<div class="divider"></div>
+							<div class="divider" data-scope="{{.ExclusiveScope}}"></div>
 						{{end}}
 						{{$previousExclusiveScope = $exclusiveScope}}
 						{{template "repo/issue/sidebar/label_list_item" dict "Label" .}}

web_src/js/features/repo-issue.ts

@@ -8,6 +8,7 @@ import {parseIssuePageInfo, toAbsoluteUrl} from '../utils.ts';
 import {GET, POST} from '../modules/fetch.ts';
 import {showErrorToast} from '../modules/toast.ts';
 import {initRepoIssueSidebar} from './repo-issue-sidebar.ts';
+import {fomanticQuery} from '../modules/fomantic/base.ts';
 
 const {appSubUrl} = window.config;
 
@@ -31,8 +32,8 @@ export function initRepoIssueSidebarList() {
   if (crossRepoSearch === 'true') {
     issueSearchUrl = `${appSubUrl}/issues/search?q={query}&priority_repo_id=${issuePageInfo.repoId}&type=${issuePageInfo.issueDependencySearchType}`;
   }
-  $('#new-dependency-drop-list')
-    .dropdown({
+  fomanticQuery('#new-dependency-drop-list').dropdown({
+    fullTextSearch: true,
     apiSettings: {
       url: issueSearchUrl,
       onResponse(response) {
@@ -54,11 +55,12 @@ export function initRepoIssueSidebarList() {
       },
       cache: false,
     },
-
-      fullTextSearch: true,
   });
+}
 
-  $('.menu a.label-filter-item').each(function () {
+export function initRepoIssueLabelFilter() {
+  // the "label-filter" is used in 2 templates: projects/view, issue/filter_list (issue list page including the milestone page)
+  $('.ui.dropdown.label-filter a.label-filter-item').each(function () {
     $(this).on('click', function (e) {
       if (e.altKey) {
         e.preventDefault();
@@ -66,11 +68,9 @@ export function initRepoIssueSidebarList() {
       }
     });
   });
-
-  // FIXME: it is wrong place to init ".ui.dropdown.label-filter"
-  $('.menu .ui.dropdown.label-filter').on('keydown', (e) => {
+  $('.ui.dropdown.label-filter').on('keydown', (e) => {
     if (e.altKey && e.key === 'Enter') {
-      const selectedItem = document.querySelector('.menu .ui.dropdown.label-filter .menu .item.selected');
+      const selectedItem = document.querySelector('.ui.dropdown.label-filter .menu .item.selected');
       if (selectedItem) {
         excludeLabel(selectedItem);
       }

web_src/js/index.ts

@@ -29,7 +29,7 @@ import {
   initRepoIssueWipTitle,
   initRepoPullRequestMergeInstruction,
   initRepoPullRequestAllowMaintainerEdit,
-  initRepoPullRequestReview, initRepoIssueSidebarList,
+  initRepoPullRequestReview, initRepoIssueSidebarList, initRepoIssueLabelFilter,
 } from './features/repo-issue.ts';
 import {initRepoEllipsisButton, initCommitStatuses} from './features/repo-commit.ts';
 import {initRepoTopicBar} from './features/repo-home.ts';
@@ -181,6 +181,7 @@ onDomReady(() => {
     initRepoGraphGit,
     initRepoIssueContentHistory,
     initRepoIssueList,
+    initRepoIssueLabelFilter,
     initRepoIssueSidebarList,
     initRepoIssueReferenceRepositorySearch,
     initRepoIssueWipTitle,

web_src/js/modules/fomantic/dropdown.test.ts

@@ -0,0 +1,56 @@
+import {createElementFromHTML} from '../../utils/dom.ts';
+import {hideScopedEmptyDividers} from './dropdown.ts';
+
+test('hideScopedEmptyDividers-simple', () => {
+  const container = createElementFromHTML(`<div>
+<div class="divider"></div>
+<div class="item">a</div>
+<div class="divider"></div>
+<div class="divider"></div>
+<div class="divider"></div>
+<div class="item">b</div>
+<div class="divider"></div>
+</div>`);
+  hideScopedEmptyDividers(container);
+  expect(container.innerHTML).toEqual(`
+<div class="divider hidden transition"></div>
+<div class="item">a</div>
+<div class="divider hidden transition"></div>
+<div class="divider hidden transition"></div>
+<div class="divider"></div>
+<div class="item">b</div>
+<div class="divider hidden transition"></div>
+`);
+});
+
+test('hideScopedEmptyDividers-hidden1', () => {
+  const container = createElementFromHTML(`<div>
+<div class="item">a</div>
+<div class="divider" data-scope="b"></div>
+<div class="item tw-hidden" data-scope="b">b</div>
+</div>`);
+  hideScopedEmptyDividers(container);
+  expect(container.innerHTML).toEqual(`
+<div class="item">a</div>
+<div class="divider hidden transition" data-scope="b"></div>
+<div class="item tw-hidden" data-scope="b">b</div>
+`);
+});
+
+test('hideScopedEmptyDividers-hidden2', () => {
+  const container = createElementFromHTML(`<div>
+<div class="item" data-scope="">a</div>
+<div class="divider" data-scope="b"></div>
+<div class="item tw-hidden" data-scope="b">b</div>
+<div class="divider" data-scope=""></div>
+<div class="item" data-scope="">c</div>
+</div>`);
+  hideScopedEmptyDividers(container);
+  expect(container.innerHTML).toEqual(`
+<div class="item" data-scope="">a</div>
+<div class="divider hidden transition" data-scope="b"></div>
+<div class="item tw-hidden" data-scope="b">b</div>
+<div class="divider hidden transition" data-scope=""></div>
+<div class="item" data-scope="">c</div>
+`);
+});

web_src/js/modules/fomantic/dropdown.ts

@@ -59,6 +59,12 @@ function updateSelectionLabel(label: HTMLElement) {
   }
 }
 
+function processMenuItems($dropdown, dropdownCall) {
+  const hideEmptyDividers = dropdownCall('setting', 'hideDividers') === 'empty';
+  const itemsMenu = $dropdown[0].querySelector('.scrolling.menu') || $dropdown[0].querySelector('.menu');
+  if (hideEmptyDividers) hideScopedEmptyDividers(itemsMenu);
+}
+
 // delegate the dropdown's template functions and callback functions to add aria attributes.
 function delegateOne($dropdown: any) {
   const dropdownCall = fomanticDropdownFn.bind($dropdown);
@@ -72,6 +78,18 @@ function delegateOne($dropdown: any) {
   // * If the "dropdown icon" is clicked again when the menu is visible, Fomantic calls "blurSearch", so hide the menu
   dropdownCall('internal', 'blurSearch', function () { oldBlurSearch.call(this); dropdownCall('hide') });
 
+  const oldFilterItems = dropdownCall('internal', 'filterItems');
+  dropdownCall('internal', 'filterItems', function (...args: any[]) {
+    oldFilterItems.call(this, ...args);
+    processMenuItems($dropdown, dropdownCall);
+  });
+
+  const oldShow = dropdownCall('internal', 'show');
+  dropdownCall('internal', 'show', function (...args: any[]) {
+    oldShow.call(this, ...args);
+    processMenuItems($dropdown, dropdownCall);
+  });
+
   // the "template" functions are used for dynamic creation (eg: AJAX)
   const dropdownTemplates = {...dropdownCall('setting', 'templates'), t: performance.now()};
   const dropdownTemplatesMenuOld = dropdownTemplates.menu;
@@ -271,3 +289,65 @@ function attachDomEvents(dropdown: HTMLElement, focusable: HTMLElement, menu: HT
     ignoreClickPreEvents = ignoreClickPreVisible = 0;
   }, true);
 }
+
+// Although Fomantic Dropdown supports "hideDividers", it doesn't really work with our "scoped dividers"
+// At the moment, "label dropdown items" use scopes, a sample case is:
+// * a-label
+// * divider
+// * scope/1
+// * scope/2
+// * divider
+// * z-label
+// when the "scope/*" are filtered out, we'd like to see "a-label" and "z-label" without the divider.
+export function hideScopedEmptyDividers(container: Element) {
+  const visibleItems: Element[] = [];
+  const curScopeVisibleItems: Element[] = [];
+  let curScope: string = '', lastVisibleScope: string = '';
+  const isScopedDivider = (item: Element) => item.matches('.divider') && item.hasAttribute('data-scope');
+  const hideDivider = (item: Element) => item.classList.add('hidden', 'transition'); // dropdown has its own classes to hide items
+
+  const handleScopeSwitch = (itemScope: string) => {
+    if (curScopeVisibleItems.length === 1 && isScopedDivider(curScopeVisibleItems[0])) {
+      hideDivider(curScopeVisibleItems[0]);
+    } else if (curScopeVisibleItems.length) {
+      if (isScopedDivider(curScopeVisibleItems[0]) && lastVisibleScope === curScope) {
+        hideDivider(curScopeVisibleItems[0]);
+        curScopeVisibleItems.shift();
+      }
+      visibleItems.push(...curScopeVisibleItems);
+      lastVisibleScope = curScope;
+    }
+    curScope = itemScope;
+    curScopeVisibleItems.length = 0;
+  };
+
+  // hide the scope dividers if the scope items are empty
+  for (const item of container.children) {
+    const itemScope = item.getAttribute('data-scope') || '';
+    if (itemScope !== curScope) {
+      handleScopeSwitch(itemScope);
+    }
+    if (!item.classList.contains('filtered') && !item.classList.contains('tw-hidden')) {
+      curScopeVisibleItems.push(item as HTMLElement);
+    }
+  }
+  handleScopeSwitch('');
+
+  // hide all leading and trailing dividers
+  while (visibleItems.length) {
+    if (!visibleItems[0].matches('.divider')) break;
+    hideDivider(visibleItems[0]);
+    visibleItems.shift();
+  }
+  while (visibleItems.length) {
+    if (!visibleItems[visibleItems.length - 1].matches('.divider')) break;
+    hideDivider(visibleItems[visibleItems.length - 1]);
+    visibleItems.pop();
+  }
+  // hide all duplicate dividers, hide current divider if next sibling is still divider
+  // no need to update "visibleItems" array since this is the last loop
+  for (const item of visibleItems) {
+    if (!item.matches('.divider')) continue;
+    if (item.nextElementSibling?.matches('.divider')) hideDivider(item);
+  }
+}

web_src/js/webcomponents/overflow-menu.ts

@@ -12,7 +12,7 @@ window.customElements.define('overflow-menu', class extends HTMLElement {
   mutationObserver: MutationObserver;
   lastWidth: number;
 
-  updateItems = throttle(100, () => { // eslint-disable-line unicorn/consistent-function-scoping -- https://github.com/sindresorhus/eslint-plugin-unicorn/issues/2088
+  updateItems = throttle(100, () => {
     if (!this.tippyContent) {
       const div = document.createElement('div');
       div.classList.add('tippy-target');