[Regression] Version 7.1.0/7.1.2 inhibits Alt+NUMBER keyboard shortcuts - despite not actually using them!

[toobaz]

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Description

When I have jupyter (either a notebook, or even just the "Home" screen) open, the browser shortcuts Alt+NUMBER (e.g. Alt+1 to switch to the first open tab in the current window) are inhibited. This is very annoying for whoever used to rely on them (in particular to switch between different jupyter notebooks!), and pretty weird given that jupyter is apparently not using these shortcuts for anything.

This is a regression because the bug is not there with jupyter 6.4.12 (tested with the same OS/browsers).

Note that even within a same window, the shortcuts will work regularly whenever the currently open tab has something else than jupyter in it. I can also use the shortcuts to move to a jupyter tab, but not to go back.

The Ctrl+PgUp/Ctrl+PgDown shortcuts are unaffected by the bug.

Reproduce

1. Launch jupyter in a new browser window
2. Launch a notebook, which will open in a new tab
3. Pres Alt+1 to go back to the "Home" window

... nothing happens.

Expected behavior

Switching to the first tab, which in the example above would be the jupyter "Home" screen.

Context

• Operating System and version: Debian Linux 12 (bookworm)
• Browser and version: tested with both Firefox 115.7.0esr, and Chromium 121.0.6167.139
• Jupyter Notebook version: 7.1.0, tested also with 7.1.2

[toobaz]

It's curious that the "Try jupyter" web page:
https://jupyter.org/try-jupyter/notebooks/?path=notebooks/Intro.ipynb

... does not trigger the bug. Maybe it's a different version? I failed to understand which jupyter notebook version it relies on.