[Qt-interest] Trying To Understand Transparent Background

[Cheung Yik Pang]

Hi all,

I have a questions about using transparent color as background color of 
widgets.

My little test program basically move a blue widget around in a 
transparent widget for every 5 seconds.  Both widgets had 
autoFillBackground set to true.

My expectation is that when the blue widget moved from area A to area B 
in the parent widget, area A will be cleared with transparent color and 
area B will be blue.  But what I get is both area A and area B became blue.

I have tried the new 4.5.3 and the 4.6 git head on Windows.  Both have 
the same result.

Have I missed something in the API documentation?

Thanks in advance.

Regards,
Cheung
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