Backport PR #4178 on branch 1.12.x (fix: masked cells were accidentally added to group 0 + mask ignored in aggregate computations in get.aggregate)

[meeseeksmachine]

Backport PR #4178: fix: masked cells were accidentally added to group 0 + mask ignored in aggregate computations in get.aggregate

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.60%. Comparing base (82b91c5) to head (fc6b350).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           1.12.x    #4181      +/-   ##
==========================================
+ Coverage   78.58%   78.60%   +0.01%     
==========================================
  Files         121      121              
  Lines       12685    12688       +3     
==========================================
+ Hits         9969     9973       +4     
+ Misses       2716     2715       -1     

Flag	Coverage Δ
hatch-test.low-vers	77.66% <94.73%> (+0.03%)	⬆️
hatch-test.pre	78.49% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/scanpy/get/_aggregated.py	93.41% <100.00%> (+0.46%)	⬆️