[ruby-core:118180] [Ruby master Bug#20525] Percent string literal with indentation support

Issue #20525 has been reported by bradgessler (Brad Gessler).

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Bug #20525: Percent string literal with indentation support
https://bugs.ruby-lang.org/issues/20525

* Author: bradgessler (Brad Gessler)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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I have code that looks like this in an application:

```ruby
ContentSlide(title: "Why Phlex?"){
  Markdown <<~MARKDOWN

  * Because its fun
  * Because its super-de-dooper
  MARKDOWN
},
```

The "squiggle" HEREDOCs strips the indentation, but the name of the HEREDOC doesn't look that great since "Markdown" appears twice. 

What I'd prefer is a string literal that deals with indentation, maybe it looks something like this:

```
ContentSlide(title: "Why Phlex?"){
  Markdown %~{
    # Why do you like markdown?

    * Because its fun
    * Because its super-de-dooper
  }
},
```

If Ruby doesn't want to go down the path of adding another type of literal, I'd propose adding a method to String that does the same thing as the `~` HEREDOC so something like this is possible:

```ruby
ContentSlide(title: "Why Phlex?"){
  Markdown %{
    # Why do you like markdown?

    * Because its fun
    * Because its super-de-dooper
  }.deindent
},
```




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