Show quick-approve button even when change is already approved

Change-Id: I8990ab9b3baacfbd5567d3b14887cf4422f3ab89
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
index 8989440..51ce9b4 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
@@ -114,6 +114,7 @@
   UIActionInfo,
 } from '../../shared/gr-js-api-interface/gr-change-actions-js-api';
 import {fireAlert} from '../../../utils/event-util';
+import {CODE_REVIEW} from '../../../utils/label-util';
 
 const ERR_BRANCH_EMPTY = 'The destination branch can’t be empty.';
 const ERR_COMMIT_EMPTY = 'The commit message can’t be empty.';
@@ -947,6 +948,16 @@
         return null;
       }
     }
+    // Allow the user to use quick approve to vote the max score on code review
+    // even if it is already granted.
+    if (
+      !result &&
+      this.change.labels[CODE_REVIEW] &&
+      this._getLabelStatus(this.change.labels[CODE_REVIEW]) === LabelStatus.OK
+    ) {
+      result = CODE_REVIEW;
+    }
+
     if (result) {
       const score = this.change.permitted_labels[result].slice(-1)[0];
       const labelInfo = this.change.labels[result];
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
index ae49a57..1098760 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
@@ -1717,6 +1717,31 @@
                 .querySelector('gr-button[data-action-key=\'review\']');
         assert.equal(approveButton.getAttribute('data-label'), 'bar+2');
       });
+
+      test('added when can approve an already-approved code review label',
+          () => {
+            element.change = {
+              current_revision: 'abc1234',
+              labels: {
+                'Code-Review': {
+                  approved: {},
+                  values: {
+                    ' 0': '',
+                    '+1': '',
+                    '+2': '',
+                  },
+                },
+              },
+              permitted_labels: {
+                'Code-Review': [' 0', '+1', '+2'],
+              },
+            };
+            flush();
+            const approveButton =
+              element.shadowRoot
+                  .querySelector('gr-button[data-action-key=\'review\']');
+            assert.isNotNull(approveButton);
+          });
     });
 
     test('adds download revision action', () => {