FLTK + Xfwm = Flicker

[André Miranda]

Hello there devs,
I don't if this is really the right place to bring this subject, if not 
I'm sorry.
Lately I've been playing with FLTK, but when a window has a PNG file and 
you try to resize, it's flickers madly.
I tested others Window Managers/DE(Cinnamon and E17) but only under 
Xfwm/Xfce the problem happens.

So, I ask you(devs), if you might give a me clue for what's wrong with 
Xfwm or FLTK.

More details here:
https://groups.google.com/forum/#!topic ... 5rO3QkAYo4 
<https://groups.google.com/forum/#%21topic/fltkgeneral/m5rO3QkAYo4>
http://www.youtube.com/watch?v=YI9pREHMWIM

Best regards,
André Miranda
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