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Up to now, I've always been able to open some folder in NB just to edit the contained files. Now NB is creating a project from every opened folder, which makes it much less comfortable for editing. :-(
Strange: I've edited the files using Favorites tab (though inconvinient). The files to edit have been from a freeform project's configuration, which had to be changed to create a new freeform project using the same build structure. Just to say it explicitly: When trying to edit these files, I've renamed the nbbuild folder and the build script before trying to open the project's folder. Now the surprise: After editing the project for the new path, when everything has been valid, the folder was not opened as a project, but as a folder - the inverse behaviour than with earlier module builds. Probably the behaviour depends on the file history: When trying to edit the folder before, I once tried it to open as a folder with correct project structure. After noticing it has been opened as a project, I renamed the nbproject folder: Opening now created a freeform project. After restarting NB, it has been opened as a PERL project. Seems, some buffering is mixing it all up.
In the meantime the issue seems to be fixed, as I'm no more running into the problem.