runOnlyPendingTimers running nested timer under setImmediate

[felipeochoa]

The following test case is failing on 19.0.2 on node 6.9.6, 7.50, and 7.7.1

it("only runs currently scheduled tasks [immediate]", function() {
    jest.useFakeTimers();
    let c1 = false,
        c2 = false;
    setImmediate(() => {
        c1 = true;
        setTimeout(() => c2 = true, 100 * 1000);
    });
    expect(c1).toBe(false);
    expect(c2).toBe(false);
    jest.runOnlyPendingTimers();
    expect(c1).toBe(true);
    expect(c2).toBe(false);  // <--------- this check fails
});

I'm not sure whether the setImmediate should be run by runOnlyPendingTimers or not (the docs say it runs "macro-tasks"), but the inner timeout should definitely not be run.

As a point of comparison, the following test passes:

it("only runs currently scheduled tasks [timeout]", function() {
    jest.useFakeTimers();
    let c1 = false,
        c2 = false;
    setTimeout(() => {  // <----- changed this line
        c1 = true;
        setTimeout(() => c2 = true, 100 * 1000);
    });
    expect(c1).toBe(false);
    expect(c2).toBe(false);
    jest.runOnlyPendingTimers();
    expect(c1).toBe(true);
    expect(c2).toBe(false);
});

You can see this live at https://repl.it/GFHY/2

[github-actions]

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