An Fl_Output widget created with no box may not always clear the output field 
when new text is outputted. The placement in the main window may make a 
difference. I have 2 screen layouts for essentially the same app. On one the 
field is properly drawn. On the other any new text written draws on top of the 
existing text.

Specifying a box top for the widget corrects this. Changing the main window 
size will redraw the text properly. High-Lighting the text will redraw it 
properly.

My guess is if no box type is specified the screen area for the output field is 
not cleared before the output text is written. High-lighting the text or moving 
the main window will redraw the background and erases the old pixel data.

FLTK  1.1.7
Win XP Pro SP2 & SP3
Visual Studio C++ 2005

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