[digler999]

I dont see anything wrong with what you just described.

    * Yes it's ok for the *owners* of the project to reject buggy code.
    * Yes it's ok for the owners of the project to accept working code.
    * Yes it's ok for the owners to "take" someones work when said person volunteered to it. 
    Thats what "contributing to open source" means.
    * Yes it's ok for the owners to use a working contribution to better their project for each and 
    every one of the users.
    * Yes its ok for someones fork to die.  Thats the fork maintainer's problem. 
    Is there anything preventing him from checking out the latest version of the code (serious question, 
    I dont know), the one that the owners incorporated and improved ?

Also, it's not "his" (the windows dev's) project. It's his contribution, which is to port the original owners' project to windows.

I dont see anything wrong here, other than the owners weren't exactly welcoming, encouraging, or perhaps helpful. That sucks, sounds like they were rude (or perhaps they turned rude when the original "dont call this fork Darktable, please" didn't get heeded ?).

What a shame, I've heard similar stories about people who try to contribute to open source and get treated badly. But again, other than being crass, I dont see any problem. It's great that windows dev contributed so much and improved. He deserves a big Thank You from everyone, especially the owners (and maybe they did ?). But the bottom line is he volunteered. He isn't owed anything.