Users should be able to close the ExtenderMenu of the InputwithExtender component pressing enter while the component is focused. The focus should remain on the input.

Adding BDDs for clarity:

Given that the user has its focus on the InputWithExtender input
And that the ExtenderMenu is open
When the user presses the Enter key in their keyboard
Then the ExtenderMenu is closed
And the user's focus remains on the input

Given that the user has its focus on the InputWithExtender input
And that the ExtenderMenu is closed
When the user uses his keyboard to modify the input's value
Then the ExtenderMenu is open