Presolve new var fixing using partial solution

[guimarqu]

No description provided.

[codecov]

Codecov Report

Patch coverage: 97.56% and project coverage change: -0.91% ⚠️

Comparison is base (37c6cf7) 82.61% compared to head (aa78e7f) 81.70%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1065      +/-   ##
==========================================
- Coverage   82.61%   81.70%   -0.91%     
==========================================
  Files          89       86       -3     
  Lines        7103     6632     -471     
==========================================
- Hits         5868     5419     -449     
+ Misses       1235     1213      -22     

Files Changed	Coverage Δ
src/Algorithm/branching/single_var_branching.jl	87.50% <ø> (-0.50%)	⬇️
src/Algorithm/presolve/helpers.jl	93.43% <96.00%> (-5.87%)	⬇️
src/Algorithm/presolve/interface.jl	78.04% <100.00%> (-0.47%)	⬇️
src/Algorithm/presolve/propagation.jl	77.77% <100.00%> (-2.23%)	⬇️

... and 65 files with indirect coverage changes

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