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Originally Posted by arivero
Well abstracted. I was wondering why the pdf was not working in the first attempt; interesting to know that they do not refresh the screen at every change, this is a curious portability issue.
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AFAIK Xlib doesn't have a "commit", so the X server doesn't know when screen drawing is finished. You need to tell it manually that drawing is finished and an update has to be done (like curses/ncurses).