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@tusharsoni52 tusharsoni52 commented Dec 8, 2025

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Description

Summary
This PR removes an unnecessary list conversion performed after a subList() operation in CreateFolderScreen(). The existing code converted the list of recipients using .toList() and then immediately applied subList(), causing an extra allocation with no functional benefit.

Problem
includedRecipients.toList().subList(0, MAX_CHAT_COUNT) results in:

  • a full copy of the original list
  • followed by creation of a subList view
  • increased memory use and avoidable iteration
  • no behavioral difference in this UI context

This violates Kotlin best practices and causes unnecessary overhead, especially when recipient lists are large.

Fix
Replaced:

includedRecipients.toList().subList(0, MAX_CHAT_COUNT)

with:

includedRecipients.subList(0, MAX_CHAT_COUNT)

This removes the redundant list conversion and relies directly on the efficient List API.

Why This is Safe
- Items are consumed in a read-only UI context
- No mutation of the underlying list occurs
- No observable behavior changes
- Improves efficiency and adheres to Kotlin best practices

Issue Reference
Fixes #14439

@tusharsoni52 tusharsoni52 changed the title Issue 14439 Remove unnecessary list conversion before subList in CreateFolderScreen #14472 Issue 14439 Remove unnecessary list conversion before subList in CreateFolderScreen Dec 8, 2025

if (!expandIncluded && state.currentFolder.includedRecipients.size > MAX_CHAT_COUNT) {
items(state.currentFolder.includedRecipients.toList().subList(0, MAX_CHAT_COUNT)) { recipient ->
items(state.currentFolder.includedRecipients.subList(0, MAX_CHAT_COUNT)) { recipient ->
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@jeffrey-signal jeffrey-signal Dec 8, 2025

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It looks like there is a compilation error here because includedRecipients is a set, and that type does not have a subList() method.

Perhaps using take() instead would work, as suggested in issue #14439.


Please run the app to test your changes prior to submitting a pull request 🙂

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Hi @jeffrey-signal,

You're right — includedRecipients is a Set, so calling subList() causes a compilation error. I’ve updated the PR to use:

includedRecipients.take(MAX_CHAT_COUNT)

This removes the unnecessary list conversion while remaining compatible with Sets, and matches the suggestion in issue #14439. Please let me know if you’d like any further adjustments.

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@x64x2 x64x2 left a comment

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stop pushing vibecoded PR.

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3 participants