do not overwrite own AbortSignal if an external AbortSignal is passed in

[phryneas]

This still needs tests so I'll keep it as draft for now.
I just wanted to put this in so I don't forget about it.

[changeset-bot]

🦋 Changeset detected

Latest commit: 94fea7d

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@12650

commit: 94fea7d

[github-actions]

size-limit report 📦

Path	Size
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (CJS)	42.85 KB (+0.23% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production) (CJS)	37.76 KB (+0.26% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client"	32.82 KB (+0.19% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production)	27.01 KB (+0.27% 🔺)
import { ApolloProvider } from "@apollo/client/react"	5.9 KB (0%)
import { ApolloProvider } from "@apollo/client/react" (production)	971 B (0%)
import { useQuery } from "@apollo/client/react"	7.21 KB (0%)
import { useQuery } from "@apollo/client/react" (production)	2.23 KB (0%)
import { useLazyQuery } from "@apollo/client/react"	7.1 KB (0%)
import { useLazyQuery } from "@apollo/client/react" (production)	2.13 KB (0%)
import { useMutation } from "@apollo/client/react"	6.45 KB (0%)
import { useMutation } from "@apollo/client/react" (production)	1.48 KB (0%)
import { useSubscription } from "@apollo/client/react"	6.77 KB (0%)
import { useSubscription } from "@apollo/client/react" (production)	1.79 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react"	8.58 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react" (production)	3.63 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react"	8.33 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react" (production)	3.38 KB (0%)
import { useLoadableQuery } from "@apollo/client/react"	8.28 KB (0%)
import { useLoadableQuery } from "@apollo/client/react" (production)	3.36 KB (0%)
import { useReadQuery } from "@apollo/client/react"	6.59 KB (0%)
import { useReadQuery } from "@apollo/client/react" (production)	1.63 KB (0%)
import { useFragment } from "@apollo/client/react"	6.65 KB (0%)
import { useFragment } from "@apollo/client/react" (production)	1.69 KB (0%)

[apollo-librarian]

⚠️ Docs preview not attached to branch

The preview was not built because the PR's base branch release-4.0 is not in the list of sources.

An Apollo team member can comment one of the following commands to dictate which branch to attach the preview to:

• !docs set-base-branch version-2.6
• !docs set-base-branch main

Build ID: 93707950b3ee8a0b3a76ea8d
Build Logs: View logs

[jerelmiller]

🎉