In JupyterLab 4.4.0a1 we are upgrading CodeMirror 6 packages (#17064) which adds a few shortcuts to the editor.

This issue is to gather feedback from community if we should keep the two new shortcuts inherited from CodeMirror or remove them. These are:

• Ctrl-m (Shift-Alt-m on macOS) which toggles the behaviour of the Tab key to allow it to move focus; previously:
  • in notebook cells Tab in edit mode was always indenting (inserting four spaces in Python) or invoking the completer; Jupyter users could press Esc to enter command mode in which Tab Tab was moving focus to next widget
  • in file editor there was no Esc equivalent so I there might be seen as a plausible accessibility improvement if documented.
• Alt-Backtick as additional binding on macOS, where IME can take over Ctrl-Space

Please let us know if these shortcuts introduce unintended behaviour, or conflict with typing on any international keyboard, or with shortcuts introduced by any popular JupyterLab or browser extension.