openSUSE / agama / 8924356118

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Added keyboard support when navigating suggested usernames (#1122)

## Problem

In #1022 the username auto-suggest feature was introduced, but the
dropdown with usernames didn't support keyboard navigation.

This PR aims to solve this, It introduces navigation with arrow keys (up
and down) and sets the value on the press of Enter.

fixes #1070 

## Solution

Now checking for keyboard events on the username input field and on the
arrow presses changing the index of the selected menu item, highlighting
the appropriate one. On the press of Enter, again using the current
value of index, the text input is populated with a value from the
usernames array.

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