Know if a snackbar is dismissed by action or not

[patou]

Proposal:

When the snackbar is dismissed by click on the action button, the observable onAction() is called, but also the observable afterDismissed().
When the snackbar is dismissed by the timer or the function dismiss(), there are just the afterDismissed() observable called.
There are no option to know if the dismissed has origin by the action or other.

The use case is to have a delete message with a cancel action, if the dismiss hasn't origin by the action, we must do the delete on server, otherwise restore in the interface the delete item.

What is the expected behavior?

We can add to boolean result in the afterDismissed :

    let snackBarRef = this.snackBar.open('The item has been removed', 'Cancel');
    snackBarRef.onAction().subscribe(() => {
      this.undoRemove();
    });
    snackBarRef.afterDismissed().subscribe((action) => {
      if (!action)
         this.doRemove();
    });

Or add a new observable :

    let snackBarRef = this.snackBar.open('The item has been removed', 'Cancel');
    snackBarRef.onAction().subscribe(() => {
      this.undoRemove();
    });
    snackBarRef.onDismiss().subscribe(() => {
       this.doRemove();
    });

What is the current behavior?

The observable afterDismissed is called everytime with or without action.

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