Fixed issue board label filtering not removing labels

Closes #21417

CHANGELOG

@@ -37,6 +37,7 @@ v 8.12.0 (unreleased)
   - Use 'git update-ref' for safer web commits !6130
   - Automatically expand hidden discussions when accessed by a permalink !5585 (Mike Greiling)
   - Remove unused mixins (ClemMakesApps)
+  - Fix issue board label filtering appending already filtered labels
   - Add search to all issue board lists
   - Fix groups sort dropdown alignment (ClemMakesApps)
   - Add horizontal scrolling to all sub-navs on mobile viewports (ClemMakesApps)

app/assets/javascripts/labels_select.js

@@ -273,12 +273,12 @@
             if (page === 'projects:boards:show') {
               if (label.isAny) {
                 gl.issueBoards.BoardsStore.state.filters['label_name'] = [];
-              } else if (label.title) {
+              } else if ($el.hasClass('is-active')) {
                 gl.issueBoards.BoardsStore.state.filters['label_name'].push(label.title);
               } else {
                 var filters = gl.issueBoards.BoardsStore.state.filters['label_name'];
-                filters = filters.filter(function (label) {
-                  return label !== $el.text().trim();
+                filters = filters.filter(function (filteredLabel) {
+                  return filteredLabel !== label.title;
                 });
                 gl.issueBoards.BoardsStore.state.filters['label_name'] = filters;
               }

spec/features/boards/boards_spec.rb

@@ -467,6 +467,25 @@ describe 'Issue Boards', feature: true, js: true do
         end
       end
 
+      it 'removes filtered labels' do
+        page.within '.labels-filter' do
+          click_button('Label')
+          wait_for_ajax
+
+          page.within '.dropdown-menu-labels' do
+            click_link(testing.title)
+          end
+
+          expect(page).to have_css('input[name="label_name[]"]', visible: false)
+
+          page.within '.dropdown-menu-labels' do
+            click_link(testing.title)
+          end
+
+          expect(page).not_to have_css('input[name="label_name[]"]', visible: false)
+        end
+      end
+
       it 'infinite scrolls list with label filter' do
         50.times do
           create(:labeled_issue, project: project, labels: [testing])