anchor.diff:  }
   
   void main() {
  -  int iter;
  +  int iter, iterations = 20;
     float tempreal, tempimag, Creal, Cimag, r2;
   
     vec2 viewport = vec2(viewportHeight, viewportHeight);
  
positive.code:       if ((data.nInserted > 0 || data.nDeleted > 0) &&
            button.label == 'Recompile') {
          button.labelfont = fl.COURIER_BOLD_ITALIC;
          button.labeltype = fl.SHADOW_LABEL;
          button.labelcolor = fl.GREEN;
          button.label = 'Recompile!';
          button.redraw();
        }
  
negative.code:   Creal = real;
    Cimag = imag;
  
    for (iter = 0; iter < iterations; iter++) {
      // z = z^2 + c
      tempreal = real;
      tempimag = imag;
  