<md-sidenav>: remove shadows in persistent mode (mode='side'), or add @Input like "shadow='on|off|auto'"

[m0nzderr]

Bug, feature request, or proposal:

I would rather consider it a feature proposal or improvement, than a bug. But one could see it as a bug if taking the MD spec literally.

What is the expected behavior?

The spec (https://material.io/guidelines/patterns/navigation-drawer.html#navigation-drawer-behavior)
states that permanent drawer (i.e., mode='side') should stay at the same elevation as the content (i.e., no shadow).

What is the current behavior?

md-sidenav allways stays above the content dropping shadow.

What are the steps to reproduce?

See, e.g, the Examples tab at https://material.angular.io/components/component/sidenav

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

Implementing the persistent navigation drawer behavior, as described here: https://material.io/guidelines/patterns/navigation-drawer.html#navigation-drawer-behavior

And being able to deliver good design, of course!

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

@angular/material 2.0.0.beta-1

Is there anything else we should know?

Thumbs up for the lib. Looking forward to new releases! I'm already moving to production with it.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}