fix(core): make sure pausedMutations always execute in serial

[TkDodo]

when resumePausedMutations is called multiple times, we are starting the second paused mutation even though the first one has not yet finished. This can happen when a focus event and an online event happen in short succession

closes #4896

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Name	Status	Preview	Comments	Updated
query	⬜️ Ignored (Inspect)			Feb 12, 2023 at 8:53AM (UTC)

[TkDodo]

@jligeza I've reverted, and here is the same PR again in draft version. I won't get around to taking another look soon, but maybe you want to look into or know why this happened 🤔

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Latest deployment of this branch, based on commit 66d3a2a:

Sandbox	Source
@tanstack/query-example-react-basic-typescript	Configuration
@tanstack/query-example-solid-basic-typescript	Configuration
@tanstack/query-example-svelte-basic	Configuration
@tanstack/query-example-vue-basic	Configuration
damp-worker-l4g8n6	Issue #4896

[codecov-commenter]

Codecov Report

Base: 91.70% // Head: 91.85% // Increases project coverage by +0.15% 🎉

Coverage data is based on head (66d3a2a) compared to base (02852dd).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4906      +/-   ##
==========================================
+ Coverage   91.70%   91.85%   +0.15%     
==========================================
  Files         111      111              
  Lines        4133     4138       +5     
  Branches     1064     1067       +3     
==========================================
+ Hits         3790     3801      +11     
+ Misses        322      316       -6     
  Partials       21       21              

Impacted Files	Coverage Δ
packages/query-core/src/mutation.ts	93.87% <100.00%> (+5.75%)	⬆️
packages/query-core/src/mutationCache.ts	100.00% <100.00%> (ø)
packages/query-core/src/queryClient.ts	96.95% <100.00%> (ø)
packages/query-core/src/retryer.ts	98.98% <100.00%> (+0.03%)	⬆️

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[TkDodo]

@jligeza can you please check one more time with this sandbox:

• https://codesandbox.io/s/icy-violet-n7dq12

I've added some log statements and they always execute in serial now for me. For some reason, the submitted mutation doesn't show up on screen though? That's why I added the extra log statements in the mutationFn. Please confirm.

[jligeza]

Works for me.