[enhancement] Display functions' docs in popup after opening parentheses

ipython currently comes with very useful CLI-based autocompletion. However, I'd like to extend a tiny additional feature into this:

is it possible, that, like IDLE, after (e.g.) opening the parentheses to a function (bar(), after a second of delay ipython can display the docstring for the function in a little tooltip (similar to the tooltip used for autocomplete)?

In IDLE: