🐛 Adjusting the savefig to adjust the stroke in the case of pdf. Also, adding tests for savefig.

[davibarreira]

Inside the savefigs.jl:

    img = string(drawsvg(plt; height=height, pad=pad))
    # Extract viewBox height from SVG string
    viewbox_match = match(r"viewBox=\"[^\"]*\s+[^\"]*\s+[^\"]*\s+([^\"]*)", img)
    viewbox_height = parse(Float64, viewbox_match[1])

    # Recompute the height to fix the stroke width
    img = string(drawsvg(U(300/viewbox_height) * plt; height=height, pad=pad))

This is an imperfect solution, but it solves the problem. What this does is to adjust the diagram size to the viewbox size by multiplying the diagram plt by U(300/viewbox_height).

A future change to the package will adjust the way it treats strokes in order to avoid having to use this fix.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.56%. Comparing base (50228ba) to head (7e36da0).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backends/savefigs.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   72.57%   73.56%   +0.98%     
==========================================
  Files          71       71              
  Lines        2498     2504       +6     
==========================================
+ Hits         1813     1842      +29     
+ Misses        685      662      -23     

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