Protect against react key duplicates (close #2278) (#2309)

* Fix duplicate react keys in post search

* Protect against duplicate react keys in feeds

2 files changed, 15 insertions, 9 deletions

diff --git a/src/lib/api/feed-manip.ts b/src/lib/api/feed-manip.ts
index 9a050fd3e..c964693c4 100644
--- a/src/lib/api/feed-manip.ts
+++ b/src/lib/api/feed-manip.ts
@@ -117,11 +117,7 @@ export class FeedViewPostsSlice {
 }
 
 export class NoopFeedTuner {
-  private keyCounter = 0
-
-  reset() {
-    this.keyCounter = 0
-  }
+  reset() {}
   tune(
     feed: FeedViewPost[],
     _opts?: {dryRun: boolean; maintainOrder: boolean},
@@ -131,13 +127,13 @@ export class NoopFeedTuner {
 }
 
 export class FeedTuner {
-  private keyCounter = 0
+  seenKeys: Set<string> = new Set()
   seenUris: Set<string> = new Set()
 
   constructor(public tunerFns: FeedTunerFn[]) {}
 
   reset() {
-    this.keyCounter = 0
+    this.seenKeys.clear()
     this.seenUris.clear()
   }
 
@@ -218,11 +214,16 @@ export class FeedTuner {
     }
 
     if (!dryRun) {
-      for (const slice of slices) {
+      slices = slices.filter(slice => {
+        if (this.seenKeys.has(slice._reactKey)) {
+          return false
+        }
         for (const item of slice.items) {
           this.seenUris.add(item.post.uri)
         }
-      }
+        this.seenKeys.add(slice._reactKey)
+        return true
+      })
     }
 
     return slices
diff --git a/src/view/screens/Search/Search.tsx b/src/view/screens/Search/Search.tsx
index 60fd21674..b522edfba 100644
--- a/src/view/screens/Search/Search.tsx
+++ b/src/view/screens/Search/Search.tsx
@@ -212,12 +212,17 @@ function SearchScreenPostResults({query}: {query: string}) {
   const items = React.useMemo(() => {
     let temp: SearchResultSlice[] = []
 
+    const seenUris = new Set()
     for (const post of posts) {
+      if (seenUris.has(post.uri)) {
+        continue
+      }
       temp.push({
         type: 'post',
         key: post.uri,
         post,
       })
+      seenUris.add(post.uri)
     }
 
     if (isFetchingNextPage) {