fix: remove unnecessary left margin from title bar icon

[18202781743]

Removed Layout.leftMargin: 2 from the title bar icon element. This
margin was causing misalignment in the title bar layout and was
determined to be unnecessary for proper visual spacing. The icon now
aligns correctly without this extra margin, improving the overall layout
consistency.

Influence:

1. Verify title bar icon alignment in different window states
2. Check layout consistency across various title bar configurations
3. Test with different icon sizes and presence/absence of title text
4. Ensure no visual regression in title bar appearance

fix: 移除标题栏图标不必要的左边距

从标题栏图标元素中移除了 Layout.leftMargin: 2。这个边距导致标题栏布局出
现错位，经确定对于正确的视觉间距是不必要的。现在图标在没有这个额外边距的
情况下能够正确对齐，提高了整体布局的一致性。

Influence:

1. 在不同窗口状态下验证标题栏图标对齐
2. 检查各种标题栏配置下的布局一致性
3. 测试不同图标大小和标题文本存在/不存在的情况
4. 确保标题栏外观没有视觉回归

PMS: BUG-335495

Summary by Sourcery

Bug Fixes:

• Remove unnecessary left margin from title bar icon to fix misalignment

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR removes an unnecessary left margin on the title bar icon by deleting the Layout.leftMargin: 2 property in TitleBar.qml, ensuring the icon aligns correctly without extra spacing across different window and layout configurations.

File-Level Changes

Change	Details	Files
Eliminate manual left margin on title bar icon	Deleted the Layout.leftMargin: 2 line under the icon element	qt6/src/qml/TitleBar.qml

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[deepin-ci-robot]

deepin pr auto review

我来对这个git diff进行代码审查：

1. 修改内容分析：

• 移除了 Layout.leftMargin: 2 这一行属性设置
• 其他代码保持不变

2. 改进建议：

a) 布局一致性：

• 移除左边距可能会导致界面布局不一致，建议确保其他相关组件也做了相应调整
• 如果是为了统一边距，建议检查整个TitleBar组件的边距设置是否保持一致

b) 代码可维护性：

• 建议在注释中说明移除左边距的原因，这样其他开发者能更容易理解这个改动
• 如果这个改动是为了修复某个特定的布局问题，建议在commit message中详细说明

c) 视觉效果：

• 移除2像素的左边距可能会影响视觉对齐，建议在不同分辨率和缩放比例下测试显示效果
• 确保这个改动不会导致图标与窗口边缘过于贴近，影响美观性

d) 潜在风险：

• 这个改动可能会影响其他依赖此组件的界面布局
• 建议进行全面的回归测试，确保没有破坏现有的UI布局

3. 建议：

• 如果确实需要移除这个边距，建议通过全局样式变量来控制，而不是直接硬编码删除
• 考虑使用DS.Style中定义的边距常量，这样可以保持样式的一致性
• 建议在代码审查时，让UI/UX设计师也参与确认这个改动

总的来说，这个改动本身很简单，但可能会对界面布局产生连锁影响，建议谨慎处理并做好充分的测试。

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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