fix(selection): syncGridSelection and preserveHidden, fixes #191

[ghiscoding]

No description provided.

[codecov-io]

Codecov Report

Merging #196 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
- Coverage   39.08%   39.06%   -0.01%     
==========================================
  Files         146      146              
  Lines        6516     6519       +3     
  Branches     2034     1953      -81     
==========================================
  Hits         2546     2546              
- Misses       3960     3964       +4     
+ Partials       10        9       -1

Impacted Files	Coverage Δ
...lickgrid/components/angular-slickgrid.component.ts	59.37% <0%> (-0.51%)	⬇️
...dules/angular-slickgrid/services/filter.service.ts	16.99% <0%> (ø)	⬆️

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