Pretty much as in Jupyter, it would be beneficial having a split cell function to divide the cell in two cells automatically carrying on the content sitting underneath the cursor.
Having something similar also for selected text is massively appreciated.
Thanks for filing. That's actually a good suggestion. It's actually not a Jupyter function that I was familiar with. Do you use the Ctrl-Shift-- shortcut to do the action usually?
@IanMatthewHuff glad you find the suggestion useful.
As for the keyboard shortcut, it depends from the app I'm using.
There are certain environments where in using key shortcuts accelerate the process or the other way round. In my experience with Jupyter (Lab), the most frequent one I use is the one to hide the project tree.
So, to answer to your question, I wouldn't scream if the combination will be not there; at the same time, if you provide it, others may find it useful.
All I can say about this aspect though, is think on how the shortcuts can be made reconfigurable. There are certain apps out of there that hardcode this aspect and if you are not working primarily with a US keyboard layout, you will be rarely able to use the proposed combinations.
Merging cells would be also a feature to be wanted, when splitting works!
Fixed in new VS Code notebook implementation
Great thanks a lot!
Hey I just checked the development version to use splitting and merging.
For some reason the splitting does not work for me yet. I can find the keyboard shortcut. When I press it nothing happens.

And merging is not yet not implemented I guess?
@tbrodbeck sorry I should have been more clear when closing. Currently our code has to use our own custom webview for the UI. As such it was difficult to implement splitting and merging. However VS Code core is now adding full support for notebook editors. When we move our implementation to this we will now support splitting. We are testing this out ourselves, but it can't ship live until the VS Code support ships.
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@tbrodbeck sorry I should have been more clear when closing. Currently our code has to use our own custom webview for the UI. As such it was difficult to implement splitting and merging. However VS Code core is now adding full support for notebook editors. When we move our implementation to this we will now support splitting. We are testing this out ourselves, but it can't ship live until the VS Code support ships.