> It seems that if I only use fl_get_canvas_id and not FL_ObjWin
> when I am trying to obtain the canvas' window ID everything works fine.
>
> Is there any reason for this?
Yes, there is.
FL_ObjWin() returns the Window containing the Form.
fl_get_canvas_id() returns the Canvas's Window. The Canvas Window is
contained within the Form Window and has a separate Window XID. You
can verify this by using the X utility program `xwininfo'. See your
favorite X utilities manual or the man page for more exciting details
on how to use this program.
spl
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