fix: [search] The background color position is incorrect

[Kakueeen]

as title

Log: fix issue

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在searchresultitemdelegate.cpp文件中，新增的代码注释应该更详细地说明为什么需要移除前导空格，以及这样做的影响。
• 在searchresultitemdelegate.cpp文件中，调整格式列表的偏移量时，应该检查offset是否为负数，以避免格式范围超出文本范围。
• 在CMakeLists.txt文件中，安装目录的更改可能会导致依赖此脚本的构建系统出现问题，需要确认新的目录toolchain是否正确且包含所需文件。

是否建议立即修改:

• 是，特别是对于searchresultitemdelegate.cpp文件中的注释和偏移量调整，这些修改应该立即进行，以确保代码的可读性和正确性。
• 对于CMakeLists.txt文件中的更改，建议在合并到主分支之前进行彻底测试，以确保不会影响构建过程。

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Kakueeen, LiHua000
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