Sorry, no changes are necessary in ido, since this can be implemented in the theme. Adding the following to '/usr/share/themes/Ambiance/gtk-3.0/gtk-widgets.css' or '/usr/share/themes/Radiance/gtk-3.0/gtk-widgets.css' fixes the issue for me.
.menuitem GtkCalendar:inconsistent { color: shade (@bg_color, 0.6); }
Sorry, no changes are necessary in ido, since this can be implemented in the theme. Adding the following to '/usr/share/ themes/ Ambiance/ gtk-3.0/ gtk-widgets. css' or '/usr/share/ themes/ Radiance/ gtk-3.0/ gtk-widgets. css' fixes the issue for me.
.menuitem GtkCalendar: inconsistent {
color: shade (@bg_color, 0.6);
}