private boolean commentChanged(String newValue, String oldValue) {
		if (newValue == null && oldValue == null) {
			return false;
		}
		if (newValue != null) {
			return !newValue.equals(oldValue);
		}
		return !oldValue.equals(newValue);
	}
return true if the newValue and oldValue are different
@param newValue the value that we desire to set
@param oldValue the existing value
@return boolean
Ghidra/Features/Base/src/main/java/ghidra/app/cmd/comments/SetCommentsCmd.java