## Summary
- Add `has_more` to contacts search API response to enable infinite
scroll without expensive count queries
- Set `count` to the number of items in the current page instead of
total count
- Implement "Load more" button for contacts search results
- Keep existing contacts visible while loading additional pages
## Changes
### Backend
- Add `fetch_contacts_with_has_more` method that fetches N+1 records to
determine if more pages exist
- Return `has_more` in search endpoint meta response
- Set `count` to current page size instead of total count
### Frontend
- Add `APPEND_CONTACTS` mutation for appending contacts without clearing
existing ones
- Update search action to support `append` parameter
- Add `ContactsLoadMore` component with loading state
- Update `ContactsListLayout` to support infinite scroll mode
- Update `ContactsIndex` to use infinite scroll for search view
Fixes the following issues
- https://chatwoot-p3.sentry.io/issues/5966466083
- https://chatwoot-p3.sentry.io/issues/5966497518
- https://chatwoot-p3.sentry.io/issues/5966555379
For the first one, I am not sure if the fix is 100% correct, since I was
not able to reproduce, but I am confident it will work.
For both, 1st and 2nd issues, the problem came from the fact that we set
individual records to `undefined` when the intent was to remove it,
explicitly using delete fixes the issue.
### Whats up with the store changes?
Glad you asked, this comes down to Vue reactivity, previously Vue didn't
track undefined strictly, it just kinda ignored it, in Vue 3, the
reactivity changed significantly when they introduced ES6 proxies. The
Proxy tracks all property changes, including those set to undefined, so
properties remain enumerable.
So to delete a record, we actually have to the delete it using the
delete keyword, or replace the parent object with a new object splicing
the object to be deleted out.
I am assuming it worked earlier because VueX 3 reactivity was using
Object.defineProperty. Setting it to undefined might have "deleted" it
earlier
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Co-authored-by: Pranav <pranav@chatwoot.com>
