[Dominik] Fast underground replace of belt changes wrong belt

[Cutemine]

Hi!

When you add a longer underground belt on over a existing line and the end of the new one happens to align with the old one, the old input gets fast-replaced as output of the new one; effectively shortening the path and not leading to the correct exit point. This might be the intended behavior, but it seemed odd to me and it might break some belt-braids.

Factorio 2018.05.23 - 22.41.35.01.gif (23.53 MiB) Viewed 5078 times

As you see in the gif, the intended endpoint of the blue undergrounds is on the right, but as the old entry gets changed to an output of the new one items actually end up in the middle.
(sorry for the huge gif but I'm currently unable to process it further)

[Dominik]

Haha, yeah, this is good. It would work like that earlier, but due to the recently fixed bug the fast replace wast not even possible.
Correct behavior in this case is easy, it should replace just one end and leave the middle yellow one in peace. But if the middle one was blue, and say the right end still yellow, it should replace the yellow end, but connect to the middle blue belt. I can't think of a better way. Can you?

[Cutemine]

yes that seems reasonable. but here the main issue is the switching from an underground input to an output

[Dominik]

Hi it is fixed, give it a try after next update. Thx

[Cutemine]

fix confirmed, thank you!