- * Removes from the list of features any that duplicate the location of a
- * feature of the same type. Should be used only for features of the same,
- * simple, feature colour (which normally implies the same feature type). Does
- * not check visibility settings for feature type or feature group. No
- * filtering is done if transparency, or any feature filters, are in force.
+ * Removes from the list of features any whose group is not shown, or that are
+ * visible and duplicate the location of a visible feature of the same type.
+ * Should be used only for features of the same, simple, feature colour (which
+ * normally implies the same feature type). No filtering is done if
+ * transparency, or any feature filters, are in force.