Add showsegments support for vizgridfallback!

[eliascarv]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 54.09836% with 56 lines in your changes missing coverage. Please review.

Project coverage is 87.42%. Comparing base (523d039) to head (c268a01).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
ext/geometryset.jl	48.83%	22 Missing ⚠️
ext/grid/cartesian.jl	47.36%	10 Missing ⚠️
ext/grid/rectilinear.jl	0.00%	9 Missing ⚠️
ext/grid/structured.jl	0.00%	8 Missing ⚠️
ext/grid.jl	46.15%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1056      +/-   ##
==========================================
- Coverage   87.85%   87.42%   -0.44%     
==========================================
  Files         187      187              
  Lines        5831     5877      +46     
==========================================
+ Hits         5123     5138      +15     
- Misses        708      739      +31     

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