Up/Down arrow (in the interactive window) are not going to the signature help when its active

[rchiodo]

Create a piece of code like so:

#%%
def myFun(arg1, arg2):
    ''' description of function '''
    print('this is my function')

Execute the cell twice.
Enter something into the input box.

Go to input prompt and type
'myFun'

When the signature help appears, it should show an up/down arrow. Hit the down arrow on the keyboard, and then the up arrow.

Expected result:

• it switches between the two signatures

Actual result:

• Previous entry in the input box is picked.