[AutoComplete] focus first item when cursor down key pressed

[jootse84]

Autocomplete does not focus first item when press down arrow key (#2596). This PR solves it by using a new property keyboardFocused on Menu component.

Closes #2596.

[oliviertassinari]

Similar to #3674.

[jootse84]

That fixed the issue long time ago, I forgot the pull-request.
If @viniciusdacal is interested he can take a look and fix the bug, if not I can try to do it by myself.

[mbrookes]

@jootse84 - @viniciusdacal closed #3674. All yours!

[viniciusdacal]

@mbrookes, I had to, when I did a rebase I lost everything, sorry 😢
I also felt a little confused, I think the docs are not updated, there is no command
npm run browser:development at package.json anymore.

[mbrookes]

A rebase won't lose everything, even if it goes wrong. 👍

You could git rebase --abort or if it's beyond that you could find your commits in get reflog and cherry-pick, or git reset --HARD <some ref before your commits> then git pull origin to get it back from github.

For rebasing - renaming the files first will help a bit, although with the new structure for ES6 classes, you might just find it easier to update from HEAD, and apply your changes manually: https://github.com/callemall/material-ui/pull/3791/files

Regarding the docs:

npm start (aka npm run browser:development) is in the docs directory package.json.

[viniciusdacal]

@mbrookes completely my bad.
Thanks for the help with git and the docs, in my daily job we don't use rebase, so I'm not used with the command.
I recreated the branch and I sent a new PR, #3867

[mbrookes]

Closing in favour of #3867.