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Bug
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    Resolution: Done
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P3: Somewhat important
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    5.13.1
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    None
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    Windows 8.1, Qt Creator 4.10.1, Qt 5.13.1 on Visual Studio 2017 32 bit
 
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        4e9c35588ccb72f09df61b81a748bde92286b45e (qtwinextras/5.14, 22.10.2019, 5.14)
 
Seems that the buttons doesn't appear in Aero Peek View in Windows 8.
I found the related StackOverflow question: https://stackoverflow.com/questions/21366339/how-to-use-qwinthumbnailtoolbar-with-qmainwindow
They suggests to move the QWinThumbnailToolBar out of ctor to main(), but I'm not sure that this is a proper fix