fix(dock): eliminate several QML runtime/compile warnings

[mhduiy]

Summary

Eliminate several QML runtime and compile warnings in dde-shell's dock and notification center by fixing the root cause rather than downgrading log levels. Covers 6 warnings across 7 files; no warning log is downgraded.

Changes

1. ShellSurfaceItemProxy: add ignoreUnknownSignals: true so the cursorShapeRequested handler no longer warns for surfaces lacking the signal.
2. TaskManager: replace the deprecated ListView.onAdd: NumberAnimation object-to-signal-handler assignment with a declarative add: Transition (consistent with the existing remove: Transition).
3. TaskManager: break the implicitWidth/implicitHeight binding loop by returning the dock size directly in the spanning layout direction (return value unchanged, dead binding computation dropped).
4. AppItem / DragItem / ActionLegacyTrayPluginDelegate: pass an explicit target size to grabToImage to avoid the "Ignoring sourceSize request" warning.
5. OverlapNotify: guard the panelShown lookup so an undefined ListView.view no longer assigns undefined to a bool property.
6. trayitempositionmanager: register the DropIndex gadget as dropIndex (lowercase) so qmltyperegistrar stops warning about its value-type name; C++ struct name and QML property access unchanged.

Test

• Dock shell surface cursor shape handling still works
• Task manager item add animation still plays
• Dock auto-size layout is unchanged
• Drag image rendering for dock and tray items
• Notification overlap animation initialization

Related

• Multica issue: https://agent-dev.uniontech.com/dde/issues/6db96431-e98a-4bcf-9b78-8c54e0329d03
• PMS: TASK-394379

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mhduiy

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Details

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• debian/deepin/OWNERS

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[sourcery-ai]

Reviewer's Guide

This PR fixes several QML runtime/compile warnings in the dock, tray, and notification center by updating signal/connection handling, correct usage of grabToImage, layout sizing logic, animation hooks, QML type registration, and a potentially-null property access.

Sequence diagram for updated drag image capture using grabToImage

sequenceDiagram
    actor User
    participant AppItem
    participant Drag
    participant Qt

    User->>AppItem: startDrag()
    AppItem->>AppItem: grabToImage(callback, Qt.size(appItem.width, appItem.height))
    AppItem-->>AppItem: callback(result)
    AppItem->>Drag: set imageSource = result.url

    User->>Drag: initiateDrag()
    Drag->>Qt: Qt.callLater(function)
    Qt-->>Drag: function()
    Drag->>Drag: set Drag.active = true

Loading

File-Level Changes

Change	Details	Files
Suppress QML warnings from Connections attached to shellSurface by ignoring unknown signals.	Add ignoreUnknownSignals: true to the Connections object bound to shellSurface to prevent warnings when signals are absent or change.	panels/dock/ShellSurfaceItemProxy.qml
Use the full grabToImage signature to provide explicit target sizes and eliminate deprecation/parameter warnings for drag previews.	Update appItem.grabToImage callback calls to pass Qt.size(appItem.width, appItem.height). Update root.grabToImage calls in tray delegates to pass Qt.size(root.width, root.height). Update dragItem.grabToImage calls in DragItem to pass Qt.size(dragItem.width, dragItem.height).	panels/dock/taskmanager/package/AppItem.qml panels/dock/tray/package/ActionLegacyTrayPluginDelegate.qml panels/dock/tray/quickpanel/DragItem.qml
Simplify TaskManager implicitWidth/implicitHeight logic for column layout vs horizontal layout and move item add animation from ListView.onAdd to a DelegateModel add transition.	Refactor implicitWidth to early-return dockSize in column layout and compute max width only for non-column layout. Refactor implicitHeight to early-return dockSize in non-column layout and compute max height only for column layout. Add an add: Transition with NumberAnimation on scale and opacity in the DelegateModel. Remove ListView.onAdd-based NumberAnimation from the delegate root to use the model transition instead.	panels/dock/taskmanager/package/TaskManager.qml
Adjust QML type registration of DropIndex to use a named element and fix QML registration-related warnings.	Replace QML_ELEMENT with QML_NAMED_ELEMENT(dropIndex) for the DropIndex struct used in tray item positioning.	panels/dock/tray/trayitempositionmanager.h
Guard OverlapNotify animation flag against a potentially-null ListView.view to avoid runtime property access warnings or errors.	Change enableAnimation binding to (root.ListView.view && root.ListView.view.panelShown) ?? false to safely handle null view and default to false.	panels/notification/center/OverlapNotify.qml

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