Clear duration timeout after dismiss

[svi3c]

Fixes #4859

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[svi3c]

I signed it!

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CLAs look good, thanks!

[svi3c]

@jelbourn from my point of view this is ready to review.

[jelbourn]

This change needs a unit test that verifies the problem it aims to resolve no longer occurs.

[jelbourn]

I would call this durationTimeoutId with comment:

/**
 * Timeout ID for the duration setTimeout call. Used to clear the timeout if the snackbar is 
 * dismissed before the duration passes.
 */
private _durationTimeoutId: number;

[jelbourn]

This should be an private method. If it were a public API and someone called it in combination with setting a duration, the earlier timeout ID would be lost and the issue this PR aims to resolve would still occur.

[svi3c]

Hi @jelbourn,

Thanks for reveiw.

I did the requested changes, but the tests seem to fail, since flush() (introduced in 4.2.0-rc.1) is missing in CI.
I'm not sure why this is the case.
I first thought, that the rc version of angular 4 in the yarn.lock might be the issue, but the travis job uses npm to install the dependencies.
When I run npm i, I get @angular/core@4.2.3 installed and it has the flush() function.

Do you have any idea how to fix this or test the behavior differently?

[jelbourn]

@svi3c

  it('should clear the dismiss timeout when dismissed before timeout expiration', fakeAsync(() => {
    let config = new MdSnackBarConfig();
    config.duration = 1000;
    snackBar.open('content', 'test', config);

    setTimeout(() => snackBar.dismiss(), 500);

    tick(600);
    viewContainerFixture.detectChanges();
    flushMicrotasks();

    expect(viewContainerFixture.isStable()).toBe(true);
  }));

[svi3c]

Hi @jelbourn,
the changes are applied.

[jelbourn]

LGTM

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