fix: 修复【画板】转换为ddf格式的图片无法打开

[myk1343]

修复【画板】转换为ddf格式的图片无法打开

Bug: https://pms.uniontech.com/bug-view-253321.html
Log: 修复【画板】转换为ddf格式的图片无法打开

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在MainWindow::initConnection函数中新增的_Exit(0);可能会导致程序异常退出，需要确认这是否是预期行为。
• 检查drawBoard()->close()返回值的具体含义，以确保调用_Exit(0);时能够正确处理。

是否建议立即修改:

• 是，需要确认新增的_Exit(0);是否符合程序的退出逻辑，并确保其返回值被正确处理。如果这不是预期的行为，应该立即进行修改。

[starhcq]

[是否满足兼容性要求] y
[是否满足commit提交规范] y
[是否满足编码规范] y
[review结论] pass
[fail原因] n/a

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: myk1343, pengfeixx

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

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[myk1343]

/merge