Fix docks becoming "pencil thin" on close and reopen [Port to main]

[mathesoncalum]

Ports the framework part of musescore/MuseScore#33402

Build configuration

musescore: musescore/MuseScore/main
musescore platforms: linux_x64 linux_arm64 macos windows_x64 windows_portable

[coderabbitai]

Actionable comments posted: 0

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request refines the dock window system's lifecycle management across three components. The QML loader for dock panels now requires both visibility and an initialization flag before activating, ensuring proper initialization sequencing. The C++ page deinitialization now explicitly calls cleanup on each dock before disconnecting. Additionally, macOS-specific widget sizing logic was refactored to always update the quick item size instead of returning early, providing consistent behavior with or without a floating window.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is missing the required template sections including CLA acknowledgment, title verification, commit message documentation, testing confirmation, and coding standards compliance checklist.	Fill out all required checklist items from the template: CLA signature, title verification, commit message details, reviewability, coding standards, unnecessary changes check, compilation verification, and unit test confirmation.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main problem being fixed: docks becoming 'pencil thin' on close and reopen, and clearly indicates this is a port to main branch.
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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[mathesoncalum]

/build

[github-actions]

Build dispatched: https://github.com/musescore/muse_framework/actions/runs/26584025762

[mathesoncalum]

/build

[github-actions]

Build dispatched: https://github.com/musescore/muse_framework/actions/runs/26623769284

[zacjansheski]

Tested on MacOS Tahoe 26.2, Windows 11, Ubuntu 22.04.3. Approved