Fix for locationlist or quickfix list stealing focus on save.

[mikijov]

Related to issue #1073. The issue must have regressed since the fix in #1293. The PR is simply re-adding original fix, albeit to different location since the codebase has changed.

I have fixed the tests as well. However, I am not very familiar with how vim testing works, so I would appreciate someone verifying it.

[codecov-io]

Codecov Report

Merging #1679 into master will increase coverage by 0.06%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master    #1679      +/-   ##
==========================================
+ Coverage   22.36%   22.42%   +0.06%     
==========================================
  Files          53       53              
  Lines        4226     4231       +5     
==========================================
+ Hits          945      949       +4     
- Misses       3281     3282       +1

Flag	Coverage Δ
#nvim	16.94% <40%> (+0.02%)	⬆️
#vim74	19.42% <40%> (+0.02%)	⬆️
#vim80	21.17% <40%> (+0.02%)	⬆️

Impacted Files	Coverage Δ
autoload/go/lint.vim	58.28% <80%> (+0.59%)	⬆️

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[bhcleek]

Thank you for the contribution!

This will affect all codepaths that populate and show the error lists, not just on save. Can you target the fix to apply only to linting that happens when saving the file?

[mikijov]

Well, here you go. Thanks for pushing me to learn a bit of vimscript. Now I feel I accomplished something (as compared to 8 hours of meetings). :-) I hope it's what you wanted.

[bhcleek]

Thanks @mikijov. On first glance, this looks right.

[bhcleek]

Thank you @mikijov . With some slight modifications, your changes have been incorporated into master as of eaef6f7