On macOS, Fl_Scroll redraws incorrectly when its area exceeds the window it is in, it seems.  I found the issue in the sample program that comes with this email or archive, as well as in my application which has nested groups.

The problem is that Fl_Cocoa_Window_Driver::scroll() never returns 1 from this function.  It does not do the checks of success in the drawn areas as they are done in X11 and Win32 counterparts.

As a stop gap, for the time being, I am patching FLTK's Fl_Cocoa_Window_Driver::scroll() to always return 1 which fixes the issue (but it is likely not very efficient).

To test the error, compile FLTK with and without the patch.

And compile the sample program main.cpp with fltk-config.

$ fltk-config --compile main.cpp

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—
Gonzalo Garramuno
ggarra13@gmail.com




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