fix loading state for fetchMore with an unchanged result

[phryneas]

Fixes #12936

[changeset-bot]

🦋 Changeset detected

Latest commit: d782ffb

The changes in this PR will be included in the next version bump.

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[pkg-pr-new]

npm i https://pkg.pr.new/apollographql/apollo-client/@apollo/client@12937 

commit: d782ffb

[github-actions]

size-limit report 📦

Path	Size
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (CJS)	42.9 KB (+0.14% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production) (CJS)	37.79 KB (-0.03% 🔽)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client"	32.66 KB (+0.02% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production)	26.88 KB (+0.28% 🔺)
import { ApolloProvider } from "@apollo/client/react"	5.91 KB (0%)
import { ApolloProvider } from "@apollo/client/react" (production)	994 B (0%)
import { useQuery } from "@apollo/client/react"	7.35 KB (0%)
import { useQuery } from "@apollo/client/react" (production)	2.38 KB (0%)
import { useLazyQuery } from "@apollo/client/react"	7.11 KB (0%)
import { useLazyQuery } from "@apollo/client/react" (production)	2.16 KB (0%)
import { useMutation } from "@apollo/client/react"	6.47 KB (0%)
import { useMutation } from "@apollo/client/react" (production)	1.52 KB (0%)
import { useSubscription } from "@apollo/client/react"	6.79 KB (0%)
import { useSubscription } from "@apollo/client/react" (production)	1.82 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react"	8.55 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react" (production)	3.63 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react"	8.34 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react" (production)	3.4 KB (0%)
import { useLoadableQuery } from "@apollo/client/react"	8.29 KB (0%)
import { useLoadableQuery } from "@apollo/client/react" (production)	3.39 KB (0%)
import { useReadQuery } from "@apollo/client/react"	6.6 KB (0%)
import { useReadQuery } from "@apollo/client/react" (production)	1.65 KB (0%)
import { useFragment } from "@apollo/client/react"	6.66 KB (0%)
import { useFragment } from "@apollo/client/react" (production)	1.71 KB (0%)

[apollo-librarian]

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Build ID: 5cc56d84144e57eb40097a28
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