+ /**
+ * Mark columns in the current column selection according to positions of sequence features
+ * @param invert - when set, mark all but columns containing given type
+ * @param extendCurrent - when set, do not clear existing column selection
+ * @param toggle - rather than explicitly set, toggle selection state
+ * @param featureType - feature type string
+ * @return true if operation affected state
+ */
+ boolean markColumnsContainingFeatures(boolean invert, boolean extendCurrent, boolean clearColumns, String featureType);