sync: from linuxdeepin/dtkwidget

[deepin-ci-robot]

Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#591

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[deepin-bot]

TAG Bot

New tag: 6.0.19
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #74

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在dwatermarkhelper_example.png文件中，新添加的图片文件没有对应的数据文件，可能导致HTML文档无法正确显示图片。
• dwatermarkhelper.zh_CN.dox文件中的代码示例中，main.cpp中的WaterMarkData对象data被多次修改，可能影响代码的可读性和维护性。
• dtitlebar.cpp文件中的eventFilter方法在处理QEvent::ShowToParent事件时，将updateButtonsState更改为handleParentWindowStateChange，需要确认这一更改是否符合预期逻辑。

是否建议立即修改:

• 是

[deepin-bot]

TAG Bot

New tag: 6.0.21
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #81

[deepin-bot]

TAG Bot

New tag: 6.0.22
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #95

[deepin-bot]

TAG Bot

New tag: 6.0.23
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #96

[deepin-bot]

TAG Bot

New tag: 6.0.24
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #100

[deepin-bot]

TAG Bot

New tag: 6.0.24.1
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #102

[deepin-bot]

TAG Bot

New tag: 6.0.25
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #104

[deepin-bot]

TAG Bot

New tag: 6.0.26
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #106

[deepin-bot]

TAG Bot

New tag: 6.0.27
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #107

[deepin-bot]

TAG Bot

New tag: 6.0.28
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #111

[deepin-bot]

TAG Bot

New tag: 6.0.29
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #113

[deepin-bot]

TAG Bot

New tag: 6.0.30
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #115

[deepin-bot]

TAG Bot

New tag: 6.0.31
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #120