delete feature flag enable_query_renderer_set_state_prevention

Reviewed By: alunyov

Differential Revision: D50332420

fbshipit-source-id: 9052fb2f83f036d2439c584ecd550c5bf3075d7c

Author: sammy-SC

packages/react-relay/ReactRelayQueryRenderer.js

@@ -171,35 +171,8 @@ class ReactRelayQueryRenderer extends React.Component<Props, State> {
         const newState = resetQueryStateForUpdate(this.props, prevState);
         const {requestCacheKey, queryFetcher} = newState;
         if (requestCacheKey != null && requestCache[requestCacheKey] != null) {
-          if (RelayFeatureFlags.ENABLE_QUERY_RENDERER_SET_STATE_PREVENTION) {
-            // $FlowFixMe[incompatible-use]
-            const fetchResult = queryFetcher.getFetchResult();
-            if (fetchResult != null) {
-              const snapshot = fetchResult.snapshot ?? null;
-              const error = fetchResult.error ?? null;
-
-              const {requestCacheKey: prevRequestCacheKey} = prevState;
-              if (prevRequestCacheKey != null) {
-                delete requestCache[prevRequestCacheKey];
-              }
-
-              newState.renderProps = getRenderProps(
-                error,
-                snapshot,
-                // $FlowFixMe[incompatible-call]
-                queryFetcher,
-                prevState.retryCallbacks,
-              );
-              newState.snapshot = snapshot;
-              newState.requestCacheKey = null;
-            } else {
-              // $FlowFixMe[incompatible-use]
-              queryFetcher.setOnDataChange(this._handleDataChange);
-            }
-          } else {
-            // $FlowFixMe[incompatible-use]
-            queryFetcher.setOnDataChange(this._handleDataChange);
-          }
+          // $FlowFixMe[incompatible-use]
+          queryFetcher.setOnDataChange(this._handleDataChange);
         }
         return newState;
       });

packages/relay-runtime/util/RelayFeatureFlags.js

@@ -28,7 +28,6 @@ export type FeatureFlags = {
   STRING_INTERN_LEVEL: number,
   USE_REACT_CACHE: boolean,
   USE_REACT_CACHE_LEGACY_TIMEOUTS: boolean,
-  ENABLE_QUERY_RENDERER_SET_STATE_PREVENTION: boolean,
   LOG_MISSING_RECORDS_IN_PROD: boolean,
   ENABLE_RELAY_OPERATION_TRACKER_SUSPENSE: boolean,
 
@@ -63,7 +62,6 @@ const RelayFeatureFlags: FeatureFlags = {
   STRING_INTERN_LEVEL: 0,
   USE_REACT_CACHE: false,
   USE_REACT_CACHE_LEGACY_TIMEOUTS: true,
-  ENABLE_QUERY_RENDERER_SET_STATE_PREVENTION: false,
   LOG_MISSING_RECORDS_IN_PROD: false,
   ENABLE_LOOSE_SUBSCRIPTION_ATTRIBUTION: false,
   ENABLE_OPERATION_TRACKER_OPTIMISTIC_UPDATES: false,