Added support for Promises in #with (closes #469).

[radekmie]

As mentioned in #469 (comment), this PR adds support for Promises in #with blocks, just like #424 did that for #if and #each.

Note that due to the way #with is implemented, it takes two "cycles" (i.e., awaits) to fully propagate those results. That should not be a problem, as #with is discouraged anyway.

[jankapunkt]

Generally approve, however I can't understand why tests do fail. Here is a snipped from the circleci run:

This looks like nothing related to this PR 🤔

[radekmie]

Interesting... They all passed locally.

[DblK]

Any idea when this PR will be merged and available?

[jankapunkt]

I think someone with permissions needs to rerun the CI or at least check on it. @denihs do you have access to the circleci and check why this failed with this very weird error message?

[denihs]

Sorry for the delay here. Two tests are failing:

[radekmie]

I tried that locally again and it worked. Then I restarted it and it fails now. I have no idea what's going on, but will try to fix it.

[jankapunkt]

@radekmie thanks for fixing this 👍

[DblK]

Hi,
Thanks @radekmie for the fixes.
@StorytellerCZ any idea when this will be merged and published?
This is blocking the deployment on my app in production.

[jankapunkt]

I can merge but publishing is on the side of the Meteor core team // cc @denihs

[DblK]

@denihs any idea when a potential 3.0.1 could be out?
I will have to fork Blaze temporary if no release coming soon.

[denihs]

Blaze@3.0.1 is out!!