update var by dist normalization

[LLehner]

Distances to anchor point are now actually normalized for each slide respectively.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.52%. Comparing base (5cd2640) to head (f7b8b2e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1065      +/-   ##
==========================================
- Coverage   65.55%   65.52%   -0.03%     
==========================================
  Files          43       43              
  Lines        6361     6356       -5     
  Branches     1063     1063              
==========================================
- Hits         4170     4165       -5     
  Misses       1808     1808              
  Partials      383      383              

Files with missing lines	Coverage Δ
src/squidpy/tl/_var_by_distance.py	65.89% <100.00%> (-1.28%)	⬇️

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[timtreis]

typo

[timtreis]

Can you describe the issue you're solving here better and then also translate this into a test?

[LLehner]

Can you describe the issue you're solving here better and then also translate this into a test?

Previous normalization was useless as it just changed the the distance values to be within [0,1] without actually changing the scale. Now the distances from categories with a lower maximum are stretched to be comparable. This doesn't affect the raw distances which are still provided when running this function. I will add a test.