[Kde-bindings] Qt, Qyoto buttons work intermediately

[James Mansion]

Arno Rehn wrote:
> Yes, trapping show and hide events is not exactly a nice way to keep track of 
> used windows. But the visibility of a window is the only feature I could think 
> of that indicates whether a window is still used or not.
>
>   
I'm not sure that show and hide are quite the right events - its the 
destroy event really.
You can logically regard the native window handle (which is owned by the 
windowing
system) as owning a reference to its on proxy object, and release it 
when the native
handle is destroyed.

I guess systems that defer instantiation of the native window until 
first show or some
such can result in a race anyway. Its definitely safer to keep such 
windows in a global
somewhere.