Resolve "Label picker: Line break on long label titles"

app/assets/javascripts/labels_select.js

@@ -311,7 +311,8 @@ export default class LabelsSelect {
           // We need to identify which items are actually labels
           if (label.id) {
-            selectedClass.push('label-item');
+            const selectedLayoutClasses = ['d-flex', 'flex-row', 'text-break-word'];
+            selectedClass.push('label-item', ...selectedLayoutClasses);
             linkEl.dataset.labelId = label.id;
           }

app/assets/stylesheets/pages/labels.scss

@@ -30,6 +30,10 @@
   .dropdown-content {
     max-height: 135px;
   }
+
+  .dropdown-label-box {
+    flex: 0 0 auto;
+  }
 }
 .dropdown-new-label {

changelogs/unreleased/48771-label-picker-line-break-on-long-label-titles.yml

+---
+title: 'Resolve Label picker: Line break on long label titles'
+merge_request: 30610
+author: 
+type: fixed

spec/features/issues/bulk_assignment_labels_spec.rb

@@ -381,7 +381,7 @@ describe 'Issues > Labels bulk assignment' do
       if unmark
         items.map do |item|
           # Make sure we are unmarking the item no matter the state it has currently
-          click_link item until find('a', text: item)[:class] == 'label-item'
+          click_link item until find('a', text: item)[:class].include? 'label-item'
         end
       end
     end