Refactor sidebar assignee&milestone&project selectors (#32465)

Follow #32460

Now the code could be much clearer than before and easier to maintain. A
lot of legacy code is removed.

Manually tested.

This PR is large enough, that fine tunes could be deferred to the future if
there is no bug found or design problem.

Screenshots:

<details>

![image](https://github.com/user-attachments/assets/35f4ab7b-1bc0-4bad-a73c-a4569328303c)

</details>

1 files changed, 1 insertions, 218 deletions

diff --git a/web_src/js/features/repo-issue-sidebar.ts b/web_src/js/features/repo-issue-sidebar.ts
index 52878848e8..45cd38d533 100644
--- a/web_src/js/features/repo-issue-sidebar.ts
+++ b/web_src/js/features/repo-issue-sidebar.ts
@@ -1,10 +1,7 @@
 import $ from 'jquery';
 import {POST} from '../modules/fetch.ts';
-import {updateIssuesMeta} from './repo-common.ts';
-import {svg} from '../svg.ts';
-import {htmlEscape} from 'escape-goat';
 import {queryElems, toggleElem} from '../utils/dom.ts';
-import {initIssueSidebarComboList, issueSidebarReloadConfirmDraftComment} from './repo-issue-sidebar-combolist.ts';
+import {initIssueSidebarComboList} from './repo-issue-sidebar-combolist.ts';
 
 function initBranchSelector() {
   const elSelectBranch = document.querySelector('.ui.dropdown.select-branch');
@@ -34,212 +31,6 @@ function initBranchSelector() {
   });
 }
 
-// List submits
-function initListSubmits(selector, outerSelector) {
-  const $list = $(`.ui.${outerSelector}.list`);
-  const $noSelect = $list.find('.no-select');
-  const $listMenu = $(`.${selector} .menu`);
-  let hasUpdateAction = $listMenu.data('action') === 'update';
-  const items = {};
-
-  $(`.${selector}`).dropdown({
-    'action': 'nothing', // do not hide the menu if user presses Enter
-    fullTextSearch: 'exact',
-    async onHide() {
-      hasUpdateAction = $listMenu.data('action') === 'update'; // Update the var
-      if (hasUpdateAction) {
-        // TODO: Add batch functionality and make this 1 network request.
-        const itemEntries = Object.entries(items);
-        for (const [elementId, item] of itemEntries) {
-          await updateIssuesMeta(
-            item['update-url'],
-            item['action'],
-            item['issue-id'],
-            elementId,
-          );
-        }
-        if (itemEntries.length) {
-          issueSidebarReloadConfirmDraftComment();
-        }
-      }
-    },
-  });
-
-  $listMenu.find('.item:not(.no-select)').on('click', function (e) {
-    e.preventDefault();
-    if (this.classList.contains('ban-change')) {
-      return false;
-    }
-
-    hasUpdateAction = $listMenu.data('action') === 'update'; // Update the var
-
-    const clickedItem = this; // eslint-disable-line unicorn/no-this-assignment
-    const scope = this.getAttribute('data-scope');
-
-    $(this).parent().find('.item').each(function () {
-      if (scope) {
-        // Enable only clicked item for scoped labels
-        if (this.getAttribute('data-scope') !== scope) {
-          return;
-        }
-        if (this !== clickedItem && !this.classList.contains('checked')) {
-          return;
-        }
-      } else if (this !== clickedItem) {
-        // Toggle for other labels
-        return;
-      }
-
-      if (this.classList.contains('checked')) {
-        $(this).removeClass('checked');
-        $(this).find('.octicon-check').addClass('tw-invisible');
-        if (hasUpdateAction) {
-          if (!($(this).data('id') in items)) {
-            items[$(this).data('id')] = {
-              'update-url': $listMenu.data('update-url'),
-              action: 'detach',
-              'issue-id': $listMenu.data('issue-id'),
-            };
-          } else {
-            delete items[$(this).data('id')];
-          }
-        }
-      } else {
-        $(this).addClass('checked');
-        $(this).find('.octicon-check').removeClass('tw-invisible');
-        if (hasUpdateAction) {
-          if (!($(this).data('id') in items)) {
-            items[$(this).data('id')] = {
-              'update-url': $listMenu.data('update-url'),
-              action: 'attach',
-              'issue-id': $listMenu.data('issue-id'),
-            };
-          } else {
-            delete items[$(this).data('id')];
-          }
-        }
-      }
-    });
-
-    // TODO: Which thing should be done for choosing review requests
-    // to make chosen items be shown on time here?
-    if (selector === 'select-assignees-modify') {
-      return false;
-    }
-
-    const listIds = [];
-    $(this).parent().find('.item').each(function () {
-      if (this.classList.contains('checked')) {
-        listIds.push($(this).data('id'));
-        $($(this).data('id-selector')).removeClass('tw-hidden');
-      } else {
-        $($(this).data('id-selector')).addClass('tw-hidden');
-      }
-    });
-    if (!listIds.length) {
-      $noSelect.removeClass('tw-hidden');
-    } else {
-      $noSelect.addClass('tw-hidden');
-    }
-    $($(this).parent().data('id')).val(listIds.join(','));
-    return false;
-  });
-  $listMenu.find('.no-select.item').on('click', function (e) {
-    e.preventDefault();
-    if (hasUpdateAction) {
-      (async () => {
-        await updateIssuesMeta(
-          $listMenu.data('update-url'),
-          'clear',
-          $listMenu.data('issue-id'),
-          '',
-        );
-        issueSidebarReloadConfirmDraftComment();
-      })();
-    }
-
-    $(this).parent().find('.item').each(function () {
-      $(this).removeClass('checked');
-      $(this).find('.octicon-check').addClass('tw-invisible');
-    });
-
-    if (selector === 'select-assignees-modify') {
-      return false;
-    }
-
-    $list.find('.item').each(function () {
-      $(this).addClass('tw-hidden');
-    });
-    $noSelect.removeClass('tw-hidden');
-    $($(this).parent().data('id')).val('');
-  });
-}
-
-function selectItem(select_id, input_id) {
-  const $menu = $(`${select_id} .menu`);
-  const $list = $(`.ui${select_id}.list`);
-  const hasUpdateAction = $menu.data('action') === 'update';
-
-  $menu.find('.item:not(.no-select)').on('click', function () {
-    $(this).parent().find('.item').each(function () {
-      $(this).removeClass('selected active');
-    });
-
-    $(this).addClass('selected active');
-    if (hasUpdateAction) {
-      (async () => {
-        await updateIssuesMeta(
-          $menu.data('update-url'),
-          '',
-          $menu.data('issue-id'),
-          $(this).data('id'),
-        );
-        issueSidebarReloadConfirmDraftComment();
-      })();
-    }
-
-    let icon = '';
-    if (input_id === '#milestone_id') {
-      icon = svg('octicon-milestone', 18, 'tw-mr-2');
-    } else if (input_id === '#project_id') {
-      icon = svg('octicon-project', 18, 'tw-mr-2');
-    } else if (input_id === '#assignee_id') {
-      icon = `<img class="ui avatar image tw-mr-2" alt="avatar" src=${$(this).data('avatar')}>`;
-    }
-
-    $list.find('.selected').html(`
-        <a class="item muted sidebar-item-link" href="${htmlEscape(this.getAttribute('data-href'))}">
-          ${icon}
-          ${htmlEscape(this.textContent)}
-        </a>
-      `);
-
-    $(`.ui${select_id}.list .no-select`).addClass('tw-hidden');
-    $(input_id).val($(this).data('id'));
-  });
-  $menu.find('.no-select.item').on('click', function () {
-    $(this).parent().find('.item:not(.no-select)').each(function () {
-      $(this).removeClass('selected active');
-    });
-
-    if (hasUpdateAction) {
-      (async () => {
-        await updateIssuesMeta(
-          $menu.data('update-url'),
-          '',
-          $menu.data('issue-id'),
-          $(this).data('id'),
-        );
-        issueSidebarReloadConfirmDraftComment();
-      })();
-    }
-
-    $list.find('.selected').html('');
-    $list.find('.no-select').removeClass('tw-hidden');
-    $(input_id).val('');
-  });
-}
-
 function initRepoIssueDue() {
   const form = document.querySelector<HTMLFormElement>('.issue-due-form');
   if (!form) return;
@@ -257,14 +48,6 @@ export function initRepoIssueSidebar() {
   initBranchSelector();
   initRepoIssueDue();
 
-  // TODO: refactor the legacy initListSubmits&selectItem to initIssueSidebarComboList
-  initListSubmits('select-assignees', 'assignees');
-  initListSubmits('select-assignees-modify', 'assignees');
-  selectItem('.select-assignee', '#assignee_id');
-
-  selectItem('.select-project', '#project_id');
-  selectItem('.select-milestone', '#milestone_id');
-
   // init the combo list: a dropdown for selecting items, and a list for showing selected items and related actions
   queryElems<HTMLElement>(document, '.issue-sidebar-combo', (el) => initIssueSidebarComboList(el));
 }