Fixed issues around the data providers being called too many times.

[Blackbaud-TrevorBurch]

No description provided.

[codecov]

Codecov Report

Merging #20 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   99.68%   99.69%   +0.01%     
==========================================
  Files          18       18              
  Lines         314      330      +16     
  Branches       38       42       +4     
==========================================
+ Hits          313      329      +16     
  Misses          1        1

Impacted Files	Coverage Δ
...modules/list-view-grid/list-view-grid.component.ts	99.33% <100%> (+0.07%)	⬆️

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[Blackbaud-SteveBrush]

@Blackbaud-TrevorBurch Is there an issue or detailed description we can add to the pull request to better explain the need for these changes?

[Blackbaud-TrevorBurch]

@Blackbaud-SteveBrush https://github.com/blackbaud/skyux-list-builder/issues/12 I had linked it through Zenhub but didn't put it in the description.

There are two issues being fixed here in reality.

1. The grid state observable was firing out of order causing extra actions to be sent. I added a watch for the lastUpdate time to ensure this doesn't happen.
2. The grid was firing the column change event too many times and thus we were firing actions to often. I've fixed this in grid but also added a check here to ensure that we only fire an action to change the columns if it is actual necessary (i.e. I check to make sure the new id array is different from the previous one)

[Blackbaud-AlexKingman]

LGTM. Thanks for tracking this down.

[Blackbaud-TrevorBurch]

@Blackbaud-SteveBrush I added some unit tests for these changes