Fuzzy text search, part 2: Add fuzzy search to learn page

[juli27]

Part of: musescore/MuseScore#15983

Refactors the playlist models to a QAbstractListModel subclass to allow the use of our SortFilterProxyModel.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: eadc4d5d-98ca-4351-9fea-5536f103f1b4

📥 Commits

Reviewing files that changed from the base of the PR and between d9878b9 and 4833259.

📒 Files selected for processing (7)

• framework/learn/qml/Muse/Learn/CMakeLists.txt
• framework/learn/qml/Muse/Learn/LearnPage.qml
• framework/learn/qml/Muse/Learn/internal/Playlist.qml
• framework/learn/qml/Muse/Learn/internal/playlistmodel.cpp
• framework/learn/qml/Muse/Learn/internal/playlistmodel.h
• framework/learn/qml/Muse/Learn/learnpagemodel.cpp
• framework/learn/qml/Muse/Learn/learnpagemodel.h

📝 Walkthrough

Walkthrough

The change adds a Qt playlist list model with playlist roles and duration formatting. LearnPageModel now exposes dedicated models for started and advanced playlists and updates them from the learn service. LearnPage.qml applies fuzzy filtering and score-based sorting. Playlist delegates use bound model and index properties for navigation, metadata, scrolling, and URL launching.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: adding fuzzy search to the learn page.
Description check	✅ Passed	The description explains the implementation, references the related issue, and completes the required checklist except for the test item.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Create PR with unit tests

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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@framework/learn/qml/Muse/Learn/internal/playlistmodel.cpp`:
- Around line 48-50: Update PlaylistModel::rowCount to return zero when the
supplied parent QModelIndex is valid, while preserving m_playlist.size() for the
invalid root index used by this flat list model.

In `@framework/learn/qml/Muse/Learn/LearnPage.qml`:
- Around line 204-222: Update the LearnPage playlist flow around the
SortFilterProxyModel to pass whether a search is active into Playlist.qml, then
handle the zero-row state separately from load failure. When an active fuzzy
search has no matches, display a dedicated no-results message; preserve the
existing “unable to load these videos” message for genuine playlist loading
failures.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: ea3f57e1-6b74-42e3-8de8-02a6d6206ee8

📥 Commits

Reviewing files that changed from the base of the PR and between d9878b9 and 5ff1a47.

📒 Files selected for processing (7)

• framework/learn/qml/Muse/Learn/CMakeLists.txt
• framework/learn/qml/Muse/Learn/LearnPage.qml
• framework/learn/qml/Muse/Learn/internal/Playlist.qml
• framework/learn/qml/Muse/Learn/internal/playlistmodel.cpp
• framework/learn/qml/Muse/Learn/internal/playlistmodel.h
• framework/learn/qml/Muse/Learn/learnpagemodel.cpp
• framework/learn/qml/Muse/Learn/learnpagemodel.h