Zero-distance guide point can't be selected, snapped to, deleted

[krilbe]

I reported it here, with a backref to this thread:

Zero-distance guide point can't be interacted with in any way

As discussed here: Please note that the problem has been confirmed by two other users; see the referenced thread, where one of them posted a screen capture to demonstrate it. The problem is that a guide point that is created using the tapemeasure, but with a zero distance from the originating point, becomes some kind of “zombie”: It can’t be snapped to, not deleted, not selected, nothing. Not even “Select all” seems to include it. One user reported that it can be found using Ruby. One user re…

Thanks folks for helping me with it, showing that it’s a reproducible bug.