fixed #1629 duplicate tab issue

[JanEggers]

this is a possible fix for #1629

[codecov]

Codecov Report

Merging #1941 into development will increase coverage by 0.65%.
The diff coverage is 91.66%.

@@               Coverage Diff               @@
##           development    #1941      +/-   ##
===============================================
+ Coverage        85.93%   86.59%   +0.65%     
===============================================
  Files               78       78              
  Lines             2098     2104       +6     
  Branches           273      275       +2     
===============================================
+ Hits              1803     1822      +19     
+ Misses             202      186      -16     
- Partials            93       96       +3

Impacted Files	Coverage Δ
src/tabs/tab.directive.ts	100% <100%> (ø)	⬆️
src/tabs/tabset.component.ts	84.12% <85.71%> (+22.46%)	⬆️

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[Flood]

@JanEggers Can you fix the broken test so this can be merged?

[JanEggers]

@valorkin can you please assist? I cant figure out why the test cases i added are not working.

Before adding the new test the pr was fine just a little less coverage.

[valorkin]

Sure, I will take a look

[JanEggers]

@IlyaSurmay : thx for fixing my pr @valorkin: can u please review and merge

[valorkin]

@SergeyKuryatnick can you tests it so we can merge

[valorkin]

Thanks for PR!