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I created a project from binary. When choosing a binary, I tried to use path completion, but it worked in a strange way (it seems that completed only binaries and didn't complete directories - I'm not sure, I didn't understand its behaviour logic, but anyhow it's unusable). That's probably an issue in file chooser, but when I trued chooser when opening a project, it worked perfectly well.
My statement wasn't precise enough, sorry. I meant that it would be fine if file chooser, not only directory chooser was able to provide a completion.