fix: Ensure we don't hold RwLock when spawning group parallelism in w…

[ritchie46]

…indow functions

#14939

[codspeed-hq]

CodSpeed Performance Report

Merging #15697 will not alter performance

_{Comparing window (84ab78c) with main (8befcd1)}

Summary

✅ 22 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.33%. Comparing base (111382f) to head (84ab78c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15697      +/-   ##
==========================================
- Coverage   81.33%   81.33%   -0.01%     
==========================================
  Files        1375     1375              
  Lines      176520   176533      +13     
  Branches     2544     2544              
==========================================
+ Hits       143581   143591      +10     
+ Misses      32458    32457       -1     
- Partials      481      485       +4     

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