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[Glitch] Fix older items possibly disappearing on timeline updates

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Port 1b91359a45 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>
This commit is contained in:
Claire 2022-04-07 11:27:35 +02:00
parent 489f250877
commit ed8a0bfbb8
1 changed files with 12 additions and 3 deletions
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15
app/javascript/flavours/glitch/reducers/timelines.js
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@ -66,13 +66,22 @@ const expandNormalizedTimeline = (state, timeline, statuses, next, isPartial, is
// Then, try to find the furthest (if properly sorted, oldest) item in the timeline that
// is newer than the most recent fetched one, as it delimits a section comprised of only
// items present in `newIds` (or that were deleted from the server, so should be removed
// items older or within `newIds` (or that were deleted from the server, so should be removed
// anyway).
// Stop the gap *after* that item.
const firstIndex = oldIds.take(lastIndex).findLastIndex(id => id !== null && compareId(id, newIds.first()) > 0) + 1;
// Make sure we aren't inserting duplicates
let insertedIds = ImmutableOrderedSet(newIds).subtract(oldIds.take(firstIndex), oldIds.skip(lastIndex)).toList();
let insertedIds = ImmutableOrderedSet(newIds).withMutations(insertedIds => {
// It is possible, though unlikely, that the slice we are replacing contains items older
// than the elements we got from the API. Get them and add them back at the back of the
// slice.
const olderIds = oldIds.slice(firstIndex, lastIndex).filter(id => id !== null && compareId(id, newIds.last()) < 0);
insertedIds.union(olderIds);
// Make sure we aren't inserting duplicates
insertedIds.subtract(oldIds.take(firstIndex), oldIds.skip(lastIndex));
}).toList();
// Finally, insert a gap marker if the data is marked as partial by the server
if (isPartial && (firstIndex === 0 || oldIds.get(firstIndex - 1) !== null)) {
insertedIds = insertedIds.unshift(null);