fix: incorrect exclusionZone in x11

[18202781743]

It caused other screen's maxed window hide when show the window,
and it's only a flag when exclusion zone is less zero in x11.

pms: TASK-365879

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在onExclusionZoneChanged函数中新增的代码检查m_dlayerShellWindow->exclusionZone()是否小于等于0，如果是则直接返回。这可能是为了防止无效的排除区域值导致后续代码执行错误。

是否建议立即修改:

• 否，当前提交的代码改动看起来是合理的，没有明显的语法或逻辑错误。但是，建议进行以下几点改进：
  • 添加注释说明为什么需要检查exclusionZone()的值，以及这个检查的目的。
  • 确保这个改动不会影响现有的功能，并且已经通过了充分的测试。
  • 如果exclusionZone()的值小于等于0是一个常见的错误情况，可以考虑在更早的阶段捕获并处理，而不是在onExclusionZoneChanged函数中直接返回。

[deepin-ci-robot]

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

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