fix: add x-dde-dock-dnd-source for dde-dock

[wjyrich]

when drag app from laucher to dock can be classified.

Log: updateDragSource

Summary by Sourcery

Enhancements:

• Extend MIME type metadata to include the drag source when moving apps between launcher and dock

[deepin-ci-robot]

deepin pr auto review

在提供的代码更改中，主要添加了一行代码，用于在mime字典中添加一个新的键值对。具体来说，添加了"text/x-dde-dock-dnd-source"键，其值为"launcher"。以下是针对此更改的一些建议：

代码质量

1. 键值对命名：确保"text/x-dde-dock-dnd-source"这个键的命名是清晰且符合项目命名规范的。如果这个键的用途不明确，建议添加注释说明其用途。
2. 代码风格：检查代码风格是否一致，例如缩进、空格和括号的使用。虽然这个更改很小，但保持代码风格的一致性有助于维护代码质量。

代码性能

1. 字典操作：在mime字典中添加键值对是一个相对轻量级的操作，通常不会对性能产生显著影响。但是，如果mime字典非常大，频繁地添加和删除键值对可能会影响性能。如果这是一个性能瓶颈，建议进行性能测试并优化。

代码安全

1. 值的安全性：确保"launcher"这个值是安全的，不会引入任何安全漏洞。如果这个值是从用户输入或其他不可信来源获取的，应该进行适当的验证和清理。

其他建议

1. 单元测试：如果这个更改会影响应用程序的行为，建议添加单元测试来验证新添加的键值对是否按预期工作。
2. 文档更新：如果这个更改会影响其他开发人员或用户，建议更新相关文档，说明新添加的键值对及其用途。

总的来说，这个更改看起来是一个小的、合理的添加，但建议进行一些额外的检查和测试以确保代码的质量、性能和安全性。

[sourcery-ai]

Reviewer's Guide

This pull request updates the drag-and-drop data by adding a new MIME type, "text/x-dde-dock-dnd-source", to specify that the drag operation originated from the launcher. This is done within the Helper.qml file when an application is dragged.

File-Level Changes

Change	Details	Files
Added a new MIME type to identify the drag source.	Set the "text/x-dde-dock-dnd-source" MIME type to "launcher" within the drag data when an application is dragged from the launcher.	qml/Helper.qml

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[sourcery-ai]

Hey @wjyrich - I've reviewed your changes - here's some feedback:

• If Helper.qml is used by drag sources other than the launcher, the 'dnd-source' value should be dynamic rather than hardcoded as 'launcher'.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, wjyrich

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• debian/deepin/OWNERS

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