[Interest] restoreOverrideCursor not working in 5.10

[Bob Babcock]

I'm seeing restoreOverrideCursor() not working in Qt widget applications 
built with Qt 5.10 under Windows 7.  The normal cursor only returns when it 
moves off the app, or at least off the widget it was over when the 
hourglass was turned on.  32-bit MinGW and 64-bit MSVC2017 both do this.  I 
also see it happening in Qt Creator 4.5.0 (not built by me).  I do not see 
this with older versions of Qt.