fix(sidebar): deduplicate repeated request IDs

packages/insomnia/src/ui/components/sidebar/project-navigation-sidebar/project-navigation-sidebar-utils.test.ts

@@ -410,6 +410,17 @@ describe('flattenCollectionChildren', () => {
 
     expect(childIds).toEqual(['req_first', 'req_mid', 'req_last']);
   });
+
+  it('de-duplicates documents sharing the same _id', () => {
+    const data: AllRequestsAndMetaInWorkspace = {
+      allRequests: [mkReq('req_dup', WS), mkReq('req_dup', WS), mkReq('req_unique', WS)],
+      allRequestMetas: [],
+      requestGroupMetas: [],
+    };
+    const ids = flattenCollectionChildren(WS, false, data).map(c => c.doc._id);
+
+    expect(ids.sort()).toEqual(['req_dup', 'req_unique']);
+  });
 });
 
 // ── filterCollection ───────────────────────────────────────────────────────

packages/insomnia/src/ui/components/sidebar/project-navigation-sidebar/project-navigation-sidebar-utils.ts

@@ -212,9 +212,18 @@ export function flattenCollectionChildren(
   const { isRequestGroup } = models.requestGroup;
   const collection: Child[] = [];
 
+  const seenIds = new Set<string>();
+  const uniqueRequests = allRequests.filter(doc => {
+    if (seenIds.has(doc._id)) {
+      return false;
+    }
+    seenIds.add(doc._id);
+    return true;
+  });
+
   // map of parentId to its direct children requests and request groups
   const requestsByParentId = new Map<string, AllRequestDoc[]>();
-  for (const req of allRequests) {
+  for (const req of uniqueRequests) {
     const allRequestsByParentId = requestsByParentId.get(req.parentId);
     if (allRequestsByParentId) {
       allRequestsByParentId.push(req);