Finding menu items: should search for more than first char (should do prefix match, like <select>)

[danbeam]

Description

When I type multi-character input while a <paper-listbox> is focused, chars 2+ should be used to find a more specific match (if typed quickly, <select> in blink waits 1s).

Expected outcome

I expect in a list of:

• Ghana
• Uganda

That if I type "ug" it'll end on "Uganda".

Actual outcome

On "u" -> "Uganda" On "g" (total of "ug") -> "Ghana"

Live Demo

https://jsfiddle.net/zguk0fqw/

Steps to reproduce

Type "ug" while focused in the rendered <paper-listbox>

Browsers Affected

• [x] Chrome
• [x] Firefox
• [x] Safari 9
• [x] Safari 8
• [x] Safari 7
• [x] Edge
• [x] IE 11
• [x] IE 10

[danbeam]

@hcarmona @tjsavage @bicknellr @notwaldorf