[Bug] Whitespace issue in HBS 2

[boris-petrov]

🐞 Describe the Bug

Check the reproduction.

🔬 Minimal Reproduction

Component foo:

{{#each (array 1 2) as |item index|~}}
  {{~#if index}},{{/if}}{{yield item}}
{{~/each}}

Use it:

(<span>
  {{#foo as |item|}}
    {{~item~}}
  {{/foo}}
</span>)

This renders:

( 1,2)

😕 Actual Behavior

Note the missing space before the closing parenthesis. There is a new line before the closing span tag so there should be a space.

Changing the usage to be something like:

(<span>
  {{#foo as |item|}}
    {{item}}
  {{/foo}}
</span>)

Fixes the issue. The space appears correctly.

🤔 Expected Behavior

A space to be there.

🌍 Environment

• Ember: 3.27.5
• Node.js/npm: 16.3
• OS: Linux
• Browser: Chrome

[lifeart]

may be related to https://github.com/glimmerjs/glimmer-vm/pull/1168

[MelSumner]

@didoo noticed this issue in one of our templates today. Wondering what the plan is to resolve?

[didoo]

I have created a small repro code here: https://ember-twiddle.com/3575bcb7229f8c689339408eb0dcbed2 in which, if you follow the content, I tried to explain what the issue is.

[boris-petrov]

A similar issue:

(
  {{~#foo as |item|}}
    {{! @glint-expect-error }}
    {{~item}}
  {{~/foo~}}
)

Renders (1,2). It should, however, be ( 1, 2) because there is no whitespace-removal before the comment.