public String getStringToHighlight(ListingTextField bf, int row, int col, ProgramLocation loc) {
		if (loc == null) {
			return null;
		}
		String s = ((SpacerFieldLocation) loc).getText();
		return StringUtilities.findWord(s, col);
	}
Returns the string to highlight
@param bf the ListingTextField
@param row the row in the field
@param col the column in the field
@param loc the programLocation.
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/field/SpacerFieldFactory.java