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Previously, in `_mismatch()`, the `DefaultIterableDiffer` first checks `_linkedRecords` for `itemTrackBy`, then checks `_unlinkedRecords`. This cause the `DefaultIterableDiffer` to move "later" items that match the `itemTrackBy` from the old collection, rather than using the "earlier" one. Now we check `_unlinkedRecords` first, so that the `DefaultIterableDiffer` can give a more stable and reasonable result after diffing. For example, rather than (`a1` and `a2` have same trackById) ``` a1 b c a2 => b a2 c a1 ``` we get ``` a1 b c a2 => b a1 c a2 ``` where a1 and a2 retain their original order despite both having the same track by value. Fixes #23815 PR Close #23941 |
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| .. | ||
| differs | ||
| change_detector_util_spec.ts | ||
| iterable.ts | ||
| util.ts | ||