public String getBeforeIndex(int part, int index) {
		if (cursorField == null) {
			return "";
		}
		return cursorField.getBeforeIndex(part, index);
	}
Returns the char, word, or sentence at the given char index.
@param part specifies char, word or sentence (See {@link AccessibleText})
@param index the character index to get data for
@return the char, word, or sentence at the given char index
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/AccessibleFieldPanelDelegate.java