Popover focus on Mac OS fix

[gilsdav]

#1795

[codecov]

Codecov Report

Merging #2031 into development will decrease coverage by 0.1%.
The diff coverage is 25%.

@@               Coverage Diff               @@
##           development    #2031      +/-   ##
===============================================
- Coverage        87.16%   87.05%   -0.11%     
===============================================
  Files               85       85              
  Lines             2259     2263       +4     
  Branches           292      292              
===============================================
+ Hits              1969     1970       +1     
- Misses             187      190       +3     
  Partials           103      103

Impacted Files	Coverage Δ
src/popover/popover.directive.ts	91.3% <25%> (-6.32%)	⬇️

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[gilsdav]

@valorkin What's wrong ?

[valorkin]

why popover needs focus?

[gilsdav]

We need to hide it when clicking on other part of page. To be able to have blur event, we need focus before (like all Windows browser does but not some OSX browers). With this correction, it works like base bootstrap component (jquery).

[SergeyKuryatnick]

Tested, looks good

[valorkin]

Thanks for PR!