Snackbar: Prevent same multiple messages option.

[Sesa1988]

Bug, feature request, or proposal:

Feature

What is the expected behavior?

Do not show the same message over and over again

What is the current behavior?

it breaks and is not reactive anymore

What are the steps to reproduce?

open a message every second, should have the same effect.
for me my error handler throws a binding error for example like every second.

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

easier global error handling.

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

7.02

[crisbeto]

This will be tricky to handle on our end, because we support showing both plain text snack bars and projected components inside the snack bar container, which means that we have no way of knowing what the content will be. You should be able to get it working on your own by keeping track of the last message that was displayed and deciding whether to show another snack bar based on it.

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