Hello. I have a problem with unexpected appearance of free pipes in the character's inventory.
1. Every time I use the "fc-gui.open/close/locked" buttons, one pipe is created in the inventory.
2. When using the pipe selection tool, new pipes are created in the inventory equal to the number of selected pipes.

I did not see any mention of this fix in your new versions (then I would try to compare and make the necessary changes myself - I understand a little about modding), so I am writing to you here.

Maybe this will give you a hint - I'm using Factorio version 1.1.110 and just a few modifications:
- IndustrialRevolution3 (3.1.30)
- IR3_LoadersStacking (1.0.13)
- aai-loaders (0.1.6)
- alien-biomes (0.6.8)
- cargo-ships (0.2.7)
- flow-config (1.0.9)

Hmm interesting, can you test with Flow Config version 1.0.7 and see if that issue persists? I'd changed how pipes are replaced in 1.0.8 related to SE causing dupes, but I wouldn't be surprised if it caused a regression with the config tool itself.

EDIT: Nvm, was able to test and this happens on latest in 2.0. Thanks for reporting this, I'll see if I can fix it tomorrow! Till then I think you'll be able to use 1.0.7 to work around this regression.

Till then I think you'll be able to use 1.0.7 to work around this regression.

I downloaded 1.0.7 and launched the game - the problem remained as it was.
Maybe I'll try older versions...

There is no such problem on version 1.0.4.

Submitted a fix in 2.0.4. I also submitted a backport of it in 1.1.4 for Factorio version 1.1, so that should work! Though I haven't dealt with backports before so uncertain if it'll behave correctly, let me know if you can't upgrade correctly.