fix: ensure dynamic width binding in QML preview

[18202781743]

1. Changed static width assignment to dynamic binding using Qt.binding
2. The preview now automatically adjusts when container width changes
3. Fixes issue where preview wouldn't resize with window
4. Maintains better visual consistency during runtime adjustments

fix: 修复 QML 预览中的动态宽度绑定问题

1. 将静态宽度分配改为使用 Qt.binding 的动态绑定
2. 预览现在会在容器宽度变化时自动调整
3. 修复了预览不会随窗口调整大小的问题
4. 在运行时调整时保持更好的视觉一致性

Summary by Sourcery

Use Qt.binding for dynamic width assignment in QML preview to ensure it automatically resizes with its container and maintains visual consistency.

Bug Fixes:

• Fix preview not resizing when container or window width changes.

Enhancements:

• Replace static width assignment with Qt.binding dynamic binding for the code preview element.

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在obj.width = Qt.binding(function () { return codePreview.width })中，使用了Qt.binding来动态绑定codePreview.width，这可能会导致性能问题，因为每次codePreview.width变化时，都会触发重新计算。
• globalObject.replace(lastPreview, obj)和lastPreview = obj这两行代码可能会引起内存泄漏，如果lastPreview对象没有被正确地删除或替换，可能会导致内存无法被回收。

是否建议立即修改:

• 是

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

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[sourcery-ai]

Reviewer's Guide

Replaces the static width assignment in QML preview with a Qt.binding expression so that the preview’s width now dynamically follows container/window size changes, improving visual consistency during runtime adjustments.

File-Level Changes

Change	Details	Files
Enable dynamic width binding for QML preview	Replaced direct obj.width assignment with a Qt.binding expression Bound obj.width to codePreview.width for live updates	examples/exhibition/ViewQMLSource.qml

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[sourcery-ai]

Hey @18202781743 - I've reviewed your changes and they look great!

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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