Sets the currently displayed value of @self to @count.
The numeric value is always clamped to make it two digits, i.e.
between -99 and 99. Setting a count of zero removes the emblem.
If this method is called, and a label was already set on the icon,
it will automatically be reset to %NULL before rendering the number,
i.e. the last method called between gtk_numerable_icon_set_count()
and gtk_numerable_icon_set_label() has always priority.
Sets the currently displayed value of @self to @count.
The numeric value is always clamped to make it two digits, i.e. between -99 and 99. Setting a count of zero removes the emblem. If this method is called, and a label was already set on the icon, it will automatically be reset to %NULL before rendering the number, i.e. the last method called between gtk_numerable_icon_set_count() and gtk_numerable_icon_set_label() has always priority.