fix(taskmanager): reject invalid drag in onEntered

[MyLeeJiEun]

1. Explicitly reject drag events when the dragged app cannot be docked
2. Set drag.accepted to false before resetting dnd state for clarity

Log: Reject invalid app drag in dock taskmanager onEntered handler
Influence: Prevents dock from accepting undockable drags

fix(taskmanager): 在 onEntered 中拒绝无效拖拽

1. 当拖拽的应用无法驻留时，显式拒绝拖拽事件
2. 在重置拖拽状态前将 drag.accepted 置为 false

Log: 在任务栏任务管理器 onEntered 中拒绝无效的应用拖拽
PMS: BUG-370799
Influence: 防止任务栏接受不可驻留的拖拽

Summary by Sourcery

Bug Fixes:

• Ensure drag events are explicitly rejected when the dragged app cannot be docked in the task manager.

[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the dock taskmanager drag-and-drop handling so that undockable app drags are explicitly rejected in the onEntered handler and the drag state is clearly reset as not accepted before clearing DnD state.

Sequence diagram for dock taskmanager onEntered drag rejection

sequenceDiagram
    actor User
    participant DragSource
    participant TaskManager
    participant Applet

    User->>DragSource: start drag app
    DragSource-->>TaskManager: onEntered(drag)
    TaskManager->>Applet: requestDockByDesktopId(desktopId)
    alt [drag source is not taskbar] and [requestDockByDesktopId returns false]
        TaskManager->>TaskManager: drag.accepted = false
        TaskManager->>TaskManager: resetDndState()
    else [dockable]
        TaskManager->>TaskManager: proceed with normal DnD handling
    end

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File-Level Changes

Change	Details	Files
Explicitly reject undockable app drags in the dock taskmanager onEntered handler and mark the drag as not accepted before resetting drag-and-drop state.	Add a conditional drag.accepted = false assignment when the dragged app cannot be docked and does not originate from the taskbar Ensure drag.accepted is set to false immediately before calling the DnD state reset helper	panels/dock/taskmanager/package/TaskManager.qml

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, mhduiy, MyLeeJiEun

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