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Trying your program on Linux / gcc / FLTK 1.4, I get the same behavior you describe.
As far as I can tell, the issue is tied to calling move_to() from inside the Scroll_B::draw() function. I don't understand _why_ it's a problem. Every change I tried to force Scroll_C to be redrawn failed.
I attach my modified version of ScrollB which provides the behavior I think you want. I moved the invocation of move_to() outside the Scroll_B::draw() method, into a callback function for ScrollB's vertical scrollbar.
I'm experiencing a problem when trying to redraw a widget. In the attached code I have tried to simplify the issue as much as I could.
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