Tool tips with a long sequence of characters overflow from the dark grey tool tip background.

[robinho81]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

If a tool tip is a string of long continuous text, we would expect this not to overflow.

What is the current behavior?

If the tool tip is very long, the text overflows the dark grey tool tip background.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-rejwbo

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

N/A

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

Angular: 5.2.10
Material: 5.2.4
OS: Windows
Typescript: 2.5.3
Browsers: Chrome 66.0.3359.181, Edge: 42.17134.1.0

Is there anything else we should know?

Interestingly enough, it works on Firefox.

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