[AutoComplete]Fix Clear Value Issue

[ochowie]

• PR has tests / docs demo, and is linted.
• Commit and PR titles begin with [ComponentName], and are in imperative form: "[Component] Fix leaky abstraction".
• Description explains the issue / use-case resolved, and auto-closes the related issue(s) (http://tr.im/vFqem).

Removed setting the searchText state from the menu close function and
moved the newRequest event after the menu close so that it can be used
to overwrite the selected value.

P.S. Sorry for the dupes. Needed to change some details on the commit message and didn't want to rewrite history.

Closes #4213

[mwildehahn]

+1 I have an autocomplete field that i use to populate a list of tokens. After you select a value, a token gets added, and I want the AutocompleteField to be empty so the user can add another value.

[phillipj]

@oliviertassinari @mbrookes any thoughts on this by any chance?

I'm struggling with the same thing, wanting to clear the displayed value after the user has selected a value from the suggested list of values.. Not seeing any plausible way around this as is, as the selected value overrides what I'm trying to set to searchText in a onNewRequest callback.

[oliviertassinari]

@ochowie Thanks for proposing this fix. I'm have merged an alternative solution with the needed unit tests.