Thomas Kluyver

I'm not quite sure what you mean. We don't use xdg-open, we use Python's webbrowser module, which tries to open the right browser on any platform. The token that's printed...

Have you disabled cookies (or installed some addon that blocks them) in Firefox? That behaviour sounds like what you'd see with cookies disabled.

@marscher `xdg-open` is mostly a generic wrapper over desktop-specific open commands (like `gio open` for Gnome and `kde-open` for KDE). I don't think it accesses the URL itself. It's possible...

We have talked about using the heading levels as structure. If we implemented that, you could create a more unique & stable ID by putting its 'heading path' in the...

I'm not sure about splitting, but I would expect copying cells to copy their metadata.

It looks like the failing tests are there on `main` as well; they don't look like anything related to this PR.

It might work if you `import testmod` and then call the functions like `testmod.thisfunc()`. It's probably best to avoid autoreload if you're doing anything that's not totally straightforward. I think...

I guess this is because prompt_toolkit handles completions on a separate thread. @Carreau , do you know what you want to do about it?

It's certainly possible to write tests for our tab completion machinery (see [some of our tests](https://github.com/ipython/ipython/blob/master/IPython/core/tests/test_completer.py)), but it doesn't test it through prompt_toolkit, which is what's running it in a...

I just ran into this as well, and installing an older version of jupyter-server (`pip install 'jupyter-server