Histogram fill

[jiangyi15]

support fill_between for Hist1D

plt.fill_between(x, y, 0, facecolor="none", hatch="///")

in TFPWA Hist1D

Hist1D.draw_fill(facecolor="none", hatch="///")

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ac14967) 77.96% compared to head (56ceea2) 78.01%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #140      +/-   ##
==========================================
+ Coverage   77.96%   78.01%   +0.05%     
==========================================
  Files         119      119              
  Lines       17967    17952      -15     
  Branches     3393     3380      -13     
==========================================
- Hits        14008    14006       -2     
+ Misses       3204     3198       -6     
+ Partials      755      748       -7     

Flag	Coverage Δ
unittests	78.01% <100.00%> (+0.05%)	⬆️

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