fix(ui): remove duplicate download items in manage slide over

[InterN0te]

Description

Prevents duplicate download items from being displayed by filtering based on title uniqueness. This improves UI clarity when the same content appears multiple times in the download status.

Summary

• Adds getUniqueByTitle function to filter duplicate download items based on title
• Applies filtering to both regular and 4K download status lists
• Improves UI clarity by preventing duplicate entries in the manage slide over

Screenshot

Before

After

Test plan

• Verify that duplicate download items no longer appear in the manage slide over
• Check that both regular and 4K download lists are properly deduplicated
• Ensure filtering doesn't affect other functionality in the component

[gauthier-th]

I can't reproduce your issue in the first place.
This is something #927 should already have fixed. How are you items downloaded?

[InterN0te]

It's almost like #927, but not in the same location: my PR is for the "Manage series", not the "Status Badge"

To reproduce, simply download a torrent for an entire season and go to "Manage Series".

This is a test a just did on develop branch, without my PR :

The status badge only shows one download:

But in "Manage Series," I have the same download ten times (I also tried with a season of 8 episodes and it only shows 8 times the download so I think it take only the 10 firsts downloads of a TV show) :

[gauthier-th]

Ah, I didn't see I forgot to implement it there too.
I'm likely biased, but I find my previous implementation way more clean and less hacky.

Could you please implement the same logic as I did on the #927 PR?

[github-actions]

This PR is stale because it has been open 30 days with no activity. Please address the feedback or provide an update to keep it open.

[github-actions]

This PR was closed because it has been stalled for 30 days with no activity. You can reopen it once you address the feedback or provide the requested changes.

[gauthier-th]

Re-opening this since it's an interesting QOL feature.

[fallenbagel]

Ah, I didn't see I forgot to implement it there too.
I'm likely biased, but I find my previous implementation way more clean and less hacky.

Could you please implement the same logic as I did on the #927 PR?

@InterN0te any update?

[InterN0te]

Hi @gauthier-th @fallenbagel ! Sorry for the delay. I've updated the PR to use the same logic as #927 - filtering by downloadId instead of title. The implementation now uses a filterDuplicateDownloads function that keeps only one entry per downloadId, which properly handles season packs where multiple episodes share the same download.

const filterDuplicateDownloads = (
  items: DownloadingItem[] | undefined
): DownloadingItem[] => {
  if (!items || items.length === 0) return [];

  const seen = new Set<string>();
  return items.filter((item) => {
    if (!item.downloadId) return true;
    if (seen.has(item.downloadId)) return false;
    seen.add(item.downloadId);
    return true;
  });
};

This is consistent with your approach in #927 and should be cleaner than the previous title-based filtering. Let me know if you'd like any changes!

[InterN0te]

The result is the same as before, but with (significantly) fewer lines of code.

Screenshot

With deduplication:

Without deduplication:

[Copilot]

Pull request overview

This PR fixes duplicate download items appearing in the manage slide over UI by filtering based on unique downloadId values. The implementation prevents the same download from being displayed multiple times, improving UI clarity.

Key Changes:

• Added filterDuplicateDownloads helper function that deduplicates download items by downloadId
• Applied filtering to both regular and 4K download status lists
• Enhanced key prop differentiation for 4K items by adding -4k- prefix

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