AddOpen code fix might add too many empty lines

[psfinaki]

Take a look:

bug.mp4

In the first case, the fix adds an extra line and then the open above it - which is reasonable.
In the second case, the fix adds two extra lines and then the open above it - which is okay but why.

This probably isn't a "bug" really, since the code compiles, but not an improvement either, since addressing this wouldn't bring new functionality. Just a small flaw kind of.