Freeze table header when scrolling

[tom10271]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

Freeze table header when scrolling

What is the current behavior?

Table header does not freeze

What are the steps to reproduce?

Providing a StackBlitz/Plunker (or similar) is the best way to get the team to see your issue.

Plunker starter (using on @master): https://goo.gl/DlHd6U

StackBlitz starter (using latest npm release): https://goo.gl/wwnhMV

https://material.angular.io/components/table/examples

Any example inside

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

It is disturbing for user to scrolling back up to what column name is that data column is

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

Angular Material 2 beta 12

Is there anything else we should know?

Sticky header is already a planned feature: #474.

[andrewseguin]

Closing as it's a duplicate of #5891

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