sync: from linuxdeepin/dtkwidget

[deepin-ci-robot]

Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#566

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[deepin-bot]

TAG Bot

New tag: 6.0.14
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #47

[deepin-bot]

TAG Bot

New tag: 6.0.15
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #48

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在DPrintPreviewDialogPrivate::initconnections()和DPrintPreviewDialogPrivate::_q_printerChanged()中，_q_customPagesFinished()替换了原来的pageRangeCombo->setCurrentIndex(PAGERANGE_ALL);，需要确认这个替换是否正确并且逻辑上是必要的。
• 在DPrintPreviewDialogPrivate::_q_pageMarginChanged()和DPrintPreviewDialogPrivate::_q_orientationChanged()中，_q_customPagesFinished()也进行了类似的替换，但同样需要确认逻辑是否正确。

是否建议立即修改:

• 是，需要确认替换后的逻辑是否与原来的逻辑一致，并且没有引入任何潜在的问题。如果_q_customPagesFinished()的调用改变了原有的功能或者逻辑不正确，那么应该立即修复。