[Qt-interest] Invalid background rendering

[Tr3wory]

Hi!

I have a widget with transparent background.
In the recent versions of Qt (namely 4.6.1 and 4.6.2) I found a very
strange behavior:
after some update it will be opaque.

I created a minimal example with 2 buttons. The buttons don't have
border and background, but after one hover event it will have.

Can somebody confirm this?

tr3w

P.S.: I use Mingw 4.4 on Windows XP.
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