[Tooltip] Hangs matInput on iPhone

[vegham]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Normal editing.

What is the current behavior?

Only allow one character input.

What are the steps to reproduce?

Open this on an iPhone: https://tinyurl.com/yd8k7pyt
Full plunker here: http://plnkr.co/edit/ySZamMTpNdhqmg59iPOO?p=preview

What is the use-case or motivation for changing an existing behavior?

n/a

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

See plunker. Only iPhone has the issue for what I know. In both Chrome and Safari.

[willshowell]

An annoying thing with plunker is that run.plnkr.co doesn't work unless you're currently editing it. Here's a stackblitz link of the issue

https://material2-rc0-xkwafd.stackblitz.io

[vegham]

Thanks Will. I was not aware.
Let me add that the issue is present in an iPhone 6 simulator as well.