fix: set search popup distance from searchLineEdit to 8

[yixinshark]

as title

Log: as title
Issue: linuxdeepin/developer-center#10398

[deepin-bot]

TAG Bot

New tag: 6.0.62
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #1674

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在SearchWidget::onAutoComplete函数中，m_completer->complete(rect().adjusted(0, 0, 0, 8));可能会导致不必要的性能开销，因为adjusted方法会创建一个新的QRect对象，而不是直接修改原始的rect对象。
• 代码中的str.remove(' ');可能会导致用户输入中的空格被删除，这可能不是预期的行为，应该确认是否需要删除空格。

是否建议立即修改:

• 是

[deepin-ci-robot]

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This pull-request has been approved by: caixr23, yixinshark

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