actually I ended up separating Stop() so it just stops and called before window closes and does one Fl::check() to catch pending output, then a separate Wait() function that has a min/max wait value that would be called after the window is closed. It's still not perfect, but with the min/max values it works most of the time even though it's not going to be even needed in most cases because after the long operation and the splash window is closed the main fltk message loop starts again. If anyone is interested, I can post the final version.
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