Rotate workers when they are all idling

[mjesun]

When all workers are idling (i.e. they are not doing any work), worker 1 keeps getting all the jobs. This is due to the for loop that pushes sequentially all jobs from worker 0 to worker n-1. Unless explicitly wanted (because of a computeWorkerKey present), this is usually not a desired behavior.

Adding an offset and a modulo should do the trick. When all workers are busy, the logic is not affected, though; the first available worker will still pick the job.

[codecov-io]

Codecov Report

Merging #4921 into master will increase coverage by 0.01%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master    #4921      +/-   ##
==========================================
+ Coverage   60.01%   60.03%   +0.01%     
==========================================
  Files         198      198              
  Lines        6555     6558       +3     
  Branches        3        3              
==========================================
+ Hits         3934     3937       +3     
  Misses       2621     2621

Impacted Files	Coverage Δ
packages/jest-worker/src/index.js	84.93% <40%> (+0.64%)	⬆️
packages/jest-editor-support/src/Runner.js	58.49% <0%> (ø)	⬆️

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[cpojer]

This is nice

[github-actions]

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