After further tests, I have come to more Xlib Error on using Fl_Double_Window
in a tile resize to 0.
It seems that this is not the better to design a complex Window.
At this time, I just change the Fl_Widget::visible() to remove all my errors
(adding a check against w() and h() being positive)
unsigned int visible() const {return !(flags_&INVISIBLE) && (w()>0) &&
(h()>0);}
Everything fine now.
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