Fix for issue with NSTableView binding #653

[killev]

Add testing target for MacOS.
Implement test for NSTableView + SignalProtocol + diff()
Fix issue with excessive reloadData in NSTableView + SignalProtocol + diff()

[codecov-io]

Codecov Report

Merging #654 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #654   +/-   ##
=======================================
  Coverage   64.71%   64.71%           
=======================================
  Files          88       88           
  Lines        3877     3877           
=======================================
  Hits         2509     2509           
  Misses       1368     1368

Impacted Files	Coverage Δ
...ervable Collections/Signal+ChangesetProtocol.swift	0% <0%> (ø)	⬆️

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Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.71%. Comparing base (1c4ce95) to head (9264178).
⚠️ Report is 54 commits behind head on master.

Files with missing lines	Patch %	Lines
...ervable Collections/Signal+ChangesetProtocol.swift	0.00%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #654      +/-   ##
==========================================
- Coverage   64.88%   64.71%   -0.17%     
==========================================
  Files          88       88              
  Lines        3867     3877      +10     
==========================================
  Hits         2509     2509              
- Misses       1358     1368      +10     

Files with missing lines	Coverage Δ
...ervable Collections/Signal+ChangesetProtocol.swift	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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