sync: from linuxdeepin/dtkwidget

[deepin-ci-robot]

Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#580

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[deepin-bot]

TAG Bot

New tag: 6.0.17
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #59

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在DAboutDialog::setProductIcon函数中，修改了logo标签的尺寸设置，这可能影响界面外观。需要确认这是否是预期的更改。
• 在DMessageManager::sendMessage_helper函数中，对content的访问进行了优化，避免了不必要的循环查找。这是一个好的改进，但需要确保content对象始终存在。
• 在DMessageManager::sendMessage_helper函数中，删除了对text_message_count变量的初始化，这可能会影响后续的循环计数。需要确认这是否是有意为之。
• 在DMessageManager::sendMessage_helper函数中，删除了对text_message_count变量的检查，这可能会导致在有多个TransientType消息时继续发送。需要确保这是否是有意为之。

是否建议立即修改:

• 是，需要确保这些更改是经过充分考虑的，并且不会引入新的问题。特别是对于DMessageManager中的更改，需要确保它们不会破坏现有的功能。