Double up GEP edges in graph output

[mbarbar]

I have trouble differentiating the purple from blue, especially when zoomed out.


Left is old, right is new.

[codecov]

Codecov Report

❌ Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.82%. Comparing base (ef21931) to head (d9c5258).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
svf/lib/Graphs/CFLGraph.cpp	0.00%	2 Missing ⚠️
svf/lib/Graphs/ConsG.cpp	0.00%	1 Missing ⚠️
svf/lib/Graphs/IRGraph.cpp	0.00%	1 Missing ⚠️
svf/lib/Graphs/VFG.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1874   +/-   ##
=======================================
  Coverage   65.82%   65.82%           
=======================================
  Files         251      251           
  Lines       24665    24668    +3     
  Branches     4661     4662    +1     
=======================================
+ Hits        16235    16238    +3     
  Misses       8430     8430           

Files with missing lines	Coverage Δ
svf/lib/Graphs/SVFG.cpp	72.30% <100.00%> (ø)
svf/lib/Graphs/ConsG.cpp	64.51% <0.00%> (ø)
svf/lib/Graphs/IRGraph.cpp	44.50% <0.00%> (ø)
svf/lib/Graphs/VFG.cpp	50.98% <0.00%> (ø)
svf/lib/Graphs/CFLGraph.cpp	30.76% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[yuleisui]

The current colour is a little too light and, unfortunately, appears almost black to me.

Could we make your purple a bit darker, or distinguish the arrow in another way, such as by changing its decoration or shape?

[mbarbar]

How about double lines?

Dashed and dotted are used for other things, so I thought best not to use that.