Fine tune more downdrop settings, use SVG for labels, improve Repo Topic Edit form (#23626)

Although it seems that some different purposes are mixed in this PR,
however, they are all related, and can be tested together, so I put them
together to save everyone's time.

Diff: `+79 −84`, everything becomes much better.

### Improve the dropdown settings.

Move all fomantic-init related code into our `fomantic.js`

Fine-tune some dropdown global settings, see the comments.

Also help to fix the first problem in #23625 , cc: @yp05327 

The "language" menu has been simplified, and it works with small-height
window better.

### Use SVG instead of `<i class="delete icon">`

It's also done by `$.fn.dropdown.settings.templates.label` , cc:
@silverwind

### Remove incorrect `tabable` CSS class

It doesn't have CSS styles, and it was only in Vue. So it's totally
unnecessary, remove it by the way.

### Improve the Repo Topic Edit form

* Simplify the code
* Add a "Cancel" button
* Align elements

Before:

<details>

![image](https://user-images.githubusercontent.com/2114189/223325782-f09532de-0c38-4742-ba86-ed35cc9a858d.png)

</details>

After:

![image](https://user-images.githubusercontent.com/2114189/226796347-207feb0a-b3cd-4820-8a3e-01930bab1069.png)

8 files changed, 63 insertions, 63 deletions

diff --git a/web_src/css/base.css b/web_src/css/base.css
index e3b3fece37..d9d93da0c3 100644
--- a/web_src/css/base.css
+++ b/web_src/css/base.css
@@ -1854,15 +1854,15 @@ footer .container .links > *:first-child {
 }
 
 footer .ui.language .menu {
-  max-height: 500px;
+  height: 500px;
+  max-height: calc(100vh - 60px);
   overflow-y: auto;
   margin-bottom: 7px;
 }
 
 footer .ui.language .svg {
   margin-right: 0.15em;
-  vertical-align: top;
-  margin-top: calc(2em - 16px);
+  margin-top: 1px;
 }
 
 footer .ui.left,
@@ -2387,6 +2387,10 @@ a.ui.label:hover {
   color: var(--color-text);
 }
 
+.ui.tertiary.button:focus {
+  color: var(--color-text-dark);
+}
+
 .ui.primary.label,
 .ui.primary.labels .label {
   background-color: var(--color-primary) !important;
diff --git a/web_src/css/helpers.css b/web_src/css/helpers.css
index 7c7d576db9..34d2895a5f 100644
--- a/web_src/css/helpers.css
+++ b/web_src/css/helpers.css
@@ -23,6 +23,7 @@
 .gt-pointer-events-none { pointer-events: none !important; }
 .gt-relative { position: relative !important; }
 .gt-overflow-x-scroll { overflow-x: scroll !important; }
+.gt-cursor-default { cursor: default !important; }
 
 .gt-mono {
   font-family: var(--fonts-monospace) !important;
diff --git a/web_src/css/repository.css b/web_src/css/repository.css
index 34c76b15c9..e2f2075946 100644
--- a/web_src/css/repository.css
+++ b/web_src/css/repository.css
@@ -3062,21 +3062,10 @@ tbody.commit-list {
   top: -2px;
 }
 
-#topic_edit {
-  margin-top: 5px;
-}
-
-#repo-topics {
-  margin-top: 5px;
-  display: flex;
-  align-items: center;
-  flex-wrap: wrap;
-}
-
-.repo-topic {
-  font-weight: normal !important;
+#repo-topics .repo-topic {
+  font-weight: normal;
   cursor: pointer;
-  margin: 2px !important;
+  margin: 2px;
 }
 
 #new-dependency-drop-list.ui.selection.dropdown {
@@ -3092,18 +3081,6 @@ tbody.commit-list {
   overflow: hidden;
 }
 
-#manage_topic {
-  font-size: 12px;
-}
-
-.label + #manage_topic {
-  margin-left: 5px;
-}
-
-.ui.small.label.topic {
-  margin-bottom: 4px;
-}
-
 .repo-header {
   display: flex;
   align-items: center;
diff --git a/web_src/js/components/DashboardRepoList.vue b/web_src/js/components/DashboardRepoList.vue
index 997a390c18..1af53aac90 100644
--- a/web_src/js/components/DashboardRepoList.vue
+++ b/web_src/js/components/DashboardRepoList.vue
@@ -1,6 +1,6 @@
 <template>
   <div>
-    <div v-if="!isOrganization" class="ui two item tabable menu">
+    <div v-if="!isOrganization" class="ui two item menu">
       <a :class="{item: true, active: tab === 'repos'}" @click="changeTab('repos')">{{ textRepository }}</a>
       <a :class="{item: true, active: tab === 'organizations'}" @click="changeTab('organizations')">{{ textOrganization }}</a>
     </div>
diff --git a/web_src/js/features/common-global.js b/web_src/js/features/common-global.js
index a10ca74ab5..a061e53d8a 100644
--- a/web_src/js/features/common-global.js
+++ b/web_src/js/features/common-global.js
@@ -83,7 +83,7 @@ export function initGlobalCommon() {
   const $uiDropdowns = $('.ui.dropdown');
 
   // do not init "custom" dropdowns, "custom" dropdowns are managed by their own code.
-  $uiDropdowns.filter(':not(.custom)').dropdown({fullTextSearch: 'exact'});
+  $uiDropdowns.filter(':not(.custom)').dropdown();
 
   // The "jump" means this dropdown is mainly used for "menu" purpose,
   // clicking an item will jump to somewhere else or trigger an action/function.
@@ -111,14 +111,12 @@ export function initGlobalCommon() {
     },
   });
 
-  // special animations/popup-directions
-  $uiDropdowns.filter('.slide.up').dropdown({transition: 'slide up'});
-  $uiDropdowns.filter('.upward').dropdown({direction: 'upward'});
+  // special popup-directions
+  $uiDropdowns.filter('.upward').dropdown('setting', 'direction', 'upward');
 
   $('.ui.checkbox').checkbox();
 
   $('.tabular.menu .item').tab();
-  $('.tabable.menu .item').tab();
 
   $('.toggle.button').on('click', function () {
     toggleElem($($(this).data('target')));
diff --git a/web_src/js/features/repo-home.js b/web_src/js/features/repo-home.js
index dfccffc794..e08e84b393 100644
--- a/web_src/js/features/repo-home.js
+++ b/web_src/js/features/repo-home.js
@@ -6,27 +6,29 @@ const {appSubUrl, csrfToken} = window.config;
 
 export function initRepoTopicBar() {
   const mgrBtn = $('#manage_topic');
+  if (!mgrBtn.length) return;
   const editDiv = $('#topic_edit');
   const viewDiv = $('#repo-topics');
   const saveBtn = $('#save_topic');
   const topicDropdown = $('#topic_edit .dropdown');
-  const topicForm = $('#topic_edit.ui.form');
-  const topicPrompts = getPrompts();
+  const topicForm = editDiv; // the old logic, editDiv is topicForm
+  const topicDropdownSearch = topicDropdown.find('input.search');
+  const topicPrompts = {
+    countPrompt: topicDropdown.attr('data-text-count-prompt'),
+    formatPrompt: topicDropdown.attr('data-text-format-prompt'),
+  };
 
   mgrBtn.on('click', () => {
     hideElem(viewDiv);
     showElem(editDiv);
+    topicDropdownSearch.focus();
   });
 
-  function getPrompts() {
-    const hidePrompt = $('#validate_prompt');
-    const prompts = {
-      countPrompt: hidePrompt.children('#count_prompt').text(),
-      formatPrompt: hidePrompt.children('#format_prompt').text()
-    };
-    hidePrompt.remove();
-    return prompts;
-  }
+  $('#cancel_topic_edit').on('click', () => {
+    hideElem(editDiv);
+    showElem(viewDiv);
+    mgrBtn.focus();
+  });
 
   saveBtn.on('click', () => {
     const topics = $('input[name=topics]').val();
@@ -39,13 +41,11 @@ export function initRepoTopicBar() {
         viewDiv.children('.topic').remove();
         if (topics.length) {
           const topicArray = topics.split(',');
-
-          const last = viewDiv.children('a').last();
           for (let i = 0; i < topicArray.length; i++) {
             const link = $('<a class="ui repo-topic large label topic"></a>');
             link.attr('href', `${appSubUrl}/explore/repos?q=${encodeURIComponent(topicArray[i])}&topic=1`);
             link.text(topicArray[i]);
-            link.insertBefore(last);
+            link.insertBefore(mgrBtn); // insert all new topics before manage button
           }
         }
         hideElem(editDiv);
@@ -86,9 +86,6 @@ export function initRepoTopicBar() {
       duration: 200,
       variation: false,
     },
-    className: {
-      label: 'ui small label'
-    },
     apiSettings: {
       url: `${appSubUrl}/explore/topics/search?q={query}`,
       throttle: 500,
@@ -101,7 +98,7 @@ export function initRepoTopicBar() {
         const query = stripTags(this.urlData.query.trim());
         let found_query = false;
         const current_topics = [];
-        topicDropdown.find('div.label.visible.topic,a.label.visible').each((_, el) => {
+        topicDropdown.find('a.label.visible').each((_, el) => {
           current_topics.push(el.getAttribute('data-value'));
         });
 
diff --git a/web_src/js/index.js b/web_src/js/index.js
index 84ffe8e5db..80edc05480 100644
--- a/web_src/js/index.js
+++ b/web_src/js/index.js
@@ -88,21 +88,15 @@ import {initFormattingReplacements} from './features/formatting.js';
 import {initCopyContent} from './features/copycontent.js';
 import {initCaptcha} from './features/captcha.js';
 import {initRepositoryActionView} from './components/RepoActionView.vue';
-import {initAriaCheckboxPatch} from './modules/aria/checkbox.js';
-import {initAriaDropdownPatch} from './modules/aria/dropdown.js';
 import {initGlobalTooltips} from './modules/tippy.js';
+import {initGiteaFomantic} from './modules/fomantic.js';
 
 // Run time-critical code as soon as possible. This is safe to do because this
 // script appears at the end of <body> and rendered HTML is accessible at that point.
+// TODO: replace them with CustomElements
 initFormattingReplacements();
-
-// Silence fomantic's error logging when tabs are used without a target content element
-$.fn.tab.settings.silent = true;
-// Disable the behavior of fomantic to toggle the checkbox when you press enter on a checkbox element.
-$.fn.checkbox.settings.enableEnterKey = false;
-// Use the patches to improve accessibility, these patches are designed to be as independent as possible, make it easy to modify or remove in the future.
-initAriaCheckboxPatch();
-initAriaDropdownPatch();
+// Init Gitea's Fomantic settings
+initGiteaFomantic();
 
 $(document).ready(() => {
   initGlobalCommon();
diff --git a/web_src/js/modules/fomantic.js b/web_src/js/modules/fomantic.js
new file mode 100644
index 0000000000..218166249f
--- /dev/null
+++ b/web_src/js/modules/fomantic.js
@@ -0,0 +1,29 @@
+import $ from 'jquery';
+import {initAriaCheckboxPatch} from './aria/checkbox.js';
+import {initAriaDropdownPatch} from './aria/dropdown.js';
+import {svg} from '../svg.js';
+
+export function initGiteaFomantic() {
+  // Silence fomantic's error logging when tabs are used without a target content element
+  $.fn.tab.settings.silent = true;
+  // Disable the behavior of fomantic to toggle the checkbox when you press enter on a checkbox element.
+  $.fn.checkbox.settings.enableEnterKey = false;
+
+  // Prevent Fomantic from guessing the popup direction.
+  // Otherwise, if the viewport height is small, Fomantic would show the popup upward,
+  // if the dropdown is at the beginning of the page, then the top part would be clipped by the window view, eg: Issue List "Sort" dropdown
+  $.fn.dropdown.settings.direction = 'downward';
+  // By default, use "exact match" for full text search
+  $.fn.dropdown.settings.fullTextSearch = 'exact';
+  // Do not use "cursor: pointer" for dropdown labels
+  $.fn.dropdown.settings.className.label += ' gt-cursor-default';
+  // Always use Gitea's SVG icons
+  $.fn.dropdown.settings.templates.label = function(_value, text, preserveHTML, className) {
+    const escape = $.fn.dropdown.settings.templates.escape;
+    return escape(text, preserveHTML) + svg('octicon-x', 16, `${className.delete} icon`);
+  };
+
+  // Use the patches to improve accessibility, these patches are designed to be as independent as possible, make it easy to modify or remove in the future.
+  initAriaCheckboxPatch();
+  initAriaDropdownPatch();
+}