Fix GraphQL Boards labels setting

app/assets/javascripts/boards/components/sidebar/board_sidebar_labels_select.vue

@@ -25,6 +25,8 @@ export default {
   data() {
     return {
       loading: false,
+      oldIid: null,
+      isEditing: false,
     };
   },
   computed: {
@@ -72,6 +74,15 @@ export default {
       return this.labelsFetchPath || projectLabelsFetchPath;
     },
   },
+  watch: {
+    activeBoardItem(_, oldVal) {
+      if (this.isEditing) {
+        this.oldIid = oldVal.iid;
+      } else {
+        this.oldIid = null;
+      }
+    },
+  },
   methods: {
     ...mapActions(['setActiveBoardItemLabels', 'setError']),
     async setLabels(payload) {
@@ -84,8 +95,14 @@ export default {
           .filter((label) => !payload.find((selected) => selected.id === label.id))
           .map((label) => label.id);
 
-        const input = { addLabelIds, removeLabelIds, projectPath: this.projectPathForActiveIssue };
+        const input = {
+          addLabelIds,
+          removeLabelIds,
+          projectPath: this.projectPathForActiveIssue,
+          iid: this.oldIid,
+        };
         await this.setActiveBoardItemLabels(input);
+        this.oldIid = null;
       } catch (e) {
         this.setError({ error: e, message: __('An error occurred while updating labels.') });
       } finally {
@@ -115,6 +132,8 @@ export default {
     :title="__('Labels')"
     :loading="loading"
     data-testid="sidebar-labels"
+    @open="isEditing = true"
+    @close="isEditing = false"
   >
     <template #collapsed>
       <gl-label

app/assets/javascripts/boards/stores/actions.js

@@ -551,7 +551,7 @@ export default {
       mutation: issueSetLabelsMutation,
       variables: {
         input: {
-          iid: String(activeBoardItem.iid),
+          iid: input.iid || String(activeBoardItem.iid),
           addLabelIds: input.addLabelIds ?? [],
           removeLabelIds: input.removeLabelIds ?? [],
           projectPath: input.projectPath,
@@ -564,7 +564,7 @@ export default {
     }
 
     commit(types.UPDATE_BOARD_ITEM_BY_ID, {
-      itemId: activeBoardItem.id,
+      itemId: getIdFromGraphQLId(data.updateIssue?.issue?.id) || activeBoardItem.id,
       prop: 'labels',
       value: data.updateIssue.issue.labels.nodes,
     });

spec/frontend/boards/components/sidebar/board_sidebar_labels_select_spec.js

@@ -97,6 +97,7 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
         addLabelIds: TEST_LABELS.map((label) => label.id),
         projectPath: TEST_ISSUE_FULLPATH,
         removeLabelIds: [],
+        iid: null,
       });
     });
   });
@@ -121,6 +122,7 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
         addLabelIds: [5, 7],
         removeLabelIds: [6],
         projectPath: TEST_ISSUE_FULLPATH,
+        iid: null,
       });
     });
   });