fix(useInfiniteScroll): improve promise handling and add flush post to watch

[nhquyss]

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Description

Follow-up improvements to #5110

For detailed, see this comment in PR

Changes

• Move promise check to early return to prevent unnecessary logic execution

• Add flush: 'post' to watch to ensure it runs after DOM updates

Additional context

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commit: de3d12d

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.96%. Comparing base (62dfb80) to head (de3d12d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5122      +/-   ##
==========================================
- Coverage   63.97%   63.96%   -0.01%     
==========================================
  Files         343      343              
  Lines        7841     7840       -1     
  Branches     2425     2412      -13     
==========================================
- Hits         5016     5015       -1     
  Misses       2286     2286              
  Partials      539      539              

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[OrbisK]

Thank you 🙏🏽

Would you mind adding some tests to cover the new handling?

[maximepvrt]

@nhquyss

[nhquyss]

Thank you 🙏🏽

Would you mind adding some tests to cover the new handling?

Hi @OrbisK, sorry for the late reply.

I’ve tried adding tests for this change, but I still haven’t been able to write one that reproduces the issue.​

So I created a small live demo to show the behavior before and after this change.

Stackblitz live demo

Without flush: 'post', the API is called twice on the initial load even though the first call already returns enough items to fill the screen.

Hope this demo helps clarify the issue!!

[nhquyss]

@nhquyss

@maximepvrt, thanks for the reminder :)

I've added a demo above.

Let me know if you need anything else!!