How to add new in Build Action from a package-CodePudding

This question was

It is hard to say which step matters or make it work, but I did do these things:

1). Right-clicked the project(test project) > Unload Project > right-clicked it again > Reload Project.

2). Closed project(test project) and then reopened it.

3). Created a .ptxt file and included it into the project. Excluded it and then included again.

CodePudding user response：

I'm not exactly sure why, or how, or what but: I deleted my local copy of the project, cloned it from the provided GitHub link, rebuilt it and re-referenced it, and it works now.

I had a few speculations why it might've not worked though all of them seem to be false:

Source Generators/Analyzers can't define their own content types/build actions. Removing the analyzer part didn't help
I was testing it on a .NET Core 3.1 project but it was a .NET Standard 2.0 Source Generator. Retargetting either project to match didn't help
The schema file, props, and/or targets files are formatted incorrectly. Checked them about more than 10 times now and I'm very sure that's not the issue
The test project's .vs or obj folder was caching an old version of the project where it didn't have custom types. I've deleted them though it didn't help, furthermore, rebuilding from an exact copy on GitHub works, just not my local copy
The project's name is too long/badly formatted(I'm getting desperate here). Also wrong, created a project with the name ClassLibrary1LONGNAMESourceGenerator (included numbers to be sure), copied the files over, and rebuilt it. Worked, so the name is not the issue
Several other crazy guesses

Thanks for all the help anyways!