firstItemPosition
computed property is not recomputed when sortedItems
changes
#600
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This PR proposes a fix for the test case highlighted in the PR #599.
The changes removes the computed property on the
firstItemPosition
getter insortable-group.ts
modifier as it's not recomputed when thesortedItems
array changes from the outside. If excessive recomputation of that getter gets expensive we could maybe use the more modern@cached
decorator from@glimmer/tracking
?