Add a failing test for a partial containing a block

[mmun]

Here is a failing test for a partial containing a block. This is in response to @sunng87's request: #504 (comment).

For comparison, here is how handlebars.js handles this situation:

https://handlebarsjs.com/playground.html#format=1&currentExample=%7B%22template%22%3A%22%7B%7B%23*inline%20%5C%22thepartial%5C%22%7D%7D%5Cnpartial%20first%20line%5Cn%7B%7B%23if%20true%7D%7D%5Cn%20%20%20%20partial%20second%20line%5Cn%7B%7B%2Fif%7D%7D%5Cnpartial%20third%20line%5Cn%7B%7B%2Finline%7D%7D%5Cnbefore%20partial%5Cn%20%20%20%20%7B%7B%3E%20thepartial%7D%7D%5Cnafter%20partial%22%2C%22partials%22%3A%5B%5D%2C%22input%22%3A%22%7B%7D%22%2C%22output%22%3A%22before%20partial%5Cn%20%20%20%20partial%20first%20line%5Cn%20%20%20%20%20%20%20%20partial%20second%20line%5Cn%20%20%20%20partial%20third%20line%5Cnafter%20partial%22%2C%22preparationScript%22%3A%22%22%2C%22handlebarsVersion%22%3A%224.7.7%22%7D

It's also worth noting that the bug does not occur if the inline partial is defined with similar indentation but without using a block. It seems to really be an issue about blocks within partials. Some examples:

Indentation is processed correctly:

{{#*inline "thepartial"}}
partial first line
    partial second line
partial third line
{{/inline}}

Indentation is not processed correctly:

{{#*inline "thepartial"}}
partial first line
{{#if true}}
    partial second line
{{/if}}
partial third line
{{/inline}}

Indentation is also not processed correctly:

{{#*inline "thepartial"}}
partial first line
{{#if true}}    partial second line{{/if}}
partial third line
{{/inline}}

[sunng87]

@mmun thank you! I will look into this issue during the weekend. If you are interested in fixing issue, let me know and I can offer help

[mmun]

@sunng87 Thanks! I'm not in urgent need of a fix so feel free to relax on the weekend :) I may fix it one day. I just wanted to make a ticket in case others run into the situation.

[sunng87]

no problem. let me look into this issue

[sunng87]

I will be tracking this in #574