Does jupyter send the whole cell to kernel when auto completion happens

[Jeff Zhang]

When user type tab, auto completion will happen. My question is does jupyter frontend send the whole cell to kernel or just send the current line to kernel ? 

If the whole cell sent to kernel, would that be too heavy for kernel ?

And if only the current line sent to kernel, will kernel get code completion correctly without the code above current line ?

Thanks in advance.

[Thomas Kluyver]

It sends the whole cell, along with the cursor position in the cell.

I don't think we've tested performance much, but I would expect that you'd need a very big cell before the extra cost of sending it all outweighs the general overhead of sending a message and waiting for a reply from the kernel.

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