[PyQt] Resize grips and Column separation aren't visible in PyQt5

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Hi All,

We've been using paid version of PyQt(Login name: 01-012138). When we tried
to port our existing application from PyQt4 to PyQt5, we noticed that the
column separation lines and resize grips are not at all visible in
QColumnView. It worked fine in PyQt4.

I've attached a sample program from Qt Demo to reproduce this issue. We are
using ColumnView extensively in Mac for important features. Please provide
a workaround or fix this ASAP.

Thanks
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