Macro "Transpose Cursor and Anchor Positions" fails sometimes

[octaeder]

Assume cursor is positioned right before aaa in the following example. Then cursor is moved down one line. So we see that the text from aaa to eee is selected (including):

Example:
Some text aaa more text
eee

But macro "Transpose Cursor and Anchor Positions" fails. The reason is that the macro wants to move the cursor to the right in the second line. But the line is not long enough.