RFR: 8266666: Implementation for snippets [v13]

[Jonathan Gibbons]

On Mon, 26 Jul 2021 14:31:27 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

> I would prefer if variables such as this that are used farther than a few lines from their definition had more meaningful names.

It's also confusing that `r` is a `String` but `r1`, `r2` (lines 209-211) are `StyledText`

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PR: https://git.openjdk.java.net/jdk/pull/4795