2 crashes in khtml trunk

[Maksim Orlovich]

>> Destructors are not a good place to call code that does foo = QPixmap();
>> it
>> can be called too late, once there's no qapp anymore.
>
> the header also says about this foo pixmap
>
> //### consider making this a pointer, seems quite heavy
>
> so it might be a good move to actually do that and avoid the problem
> altogether...
>
> (patch attached)

Thanks for doing this --- please commit..