Comment 9 for bug 257685

In src/widgets/sp-color-slider.cpp, line 332, this little modification seems to fix the problem:

 if (!adjustment) {
  adjustment = (GtkAdjustment *) gtk_adjustment_new (0.0, 0.0, 1.0, 0.01, 0.0, 0.0);
 }
 //in case of existing adjustment
    gtk_adjustment_set_page_increment(adjustment, 0.0);
    gtk_adjustment_set_page_size(adjustment, 0.0);

Maybe someone with knowledge of the older SP-vintage widgets can decide if this is a valid fix or is merely fixing the symptom.

Posting this to the maillist.