Intuitive search ordering of filtered data

[rapterjet2004]

• fixes Unintuitive search results #6170

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
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[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/25810436517/artifacts/6975286920
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
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[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/25878536561/artifacts/7002121146
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Improves search ordering in the conversations list so that filtered results show exact matches first, then word-boundary matches, then the remainder, across local conversations, open conversations, contacts, and message results.

Changes:

• Introduces a generic processOrderAndAdd helper to reorder a list by up to two predicates before invoking an addAction.
• Applies this ordering to the four result groups (local conversations, open conversations, contacts, messages) using regex-based matching.
• Adds a small Iterable<T>.split extension to partition lists by a predicate.

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[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/25928985499/artifacts/7022662582
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/26045148322/artifacts/7063465933
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)