prettier: bug(handlebars): Idempotency issue

Description

<Textarea />

{{#if true}}
  Test
{{/if}}

is formatted to

<Textarea />
{{#if true}}
  Test
{{/if}}

And

<Textarea />
{{#if true}}
  Test
{{/if}}

is formatted to

<Textarea />

{{#if true}}
  Test
{{/if}}

Report

Prettier 2.0.5 Playground link

--parser glimmer
--print-width 40

Input:

<Textarea />
{{#if true}}
  Test
{{/if}}
  
<Textarea />

{{#if true}}
  Test
{{/if}}

Output:

<Textarea />

{{#if true}}
  Test
{{/if}}
<Textarea />
{{#if true}}
  Test
{{/if}}

Expected behavior (maybe):

<Textarea />
{{#if true}}
  Test
{{/if}}
  
<Textarea />

{{#if true}}
  Test
{{/if}}