[fltk.general] Transparency on edge of Window with FL_ROUND_BOX

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Transparency on edge of Window with FL_ROUND_BOX Jeff Paranich Apr 30, 2021 top right image
  Hi all,

In an attempt to make FLTK a smidge more modern looking, I've disabled the title bar (window decorations) on my GUI and changed box to FL_ROUND_BOX; but notice it still draws a black background outside the rounded corner.  Is there a way to change this to a transparency?  Here is an image for reference...


Thank you!

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