RFR: 8276124: Provide snippet support for properties files [v4]

[Jonathan Gibbons]

On Tue, 23 Nov 2021 12:56:14 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

> > It would be nice to define/support the markup characteristics of "plain text" snippets, where "plain text" might be a stand-in for commands, or stack traces, or other less common formats.
> 
> If we are to do it, we should discuss and implement it quickly, before RDP 1. We would still be able to do it later, before RC, but only with approval. Here are some questions to discuss.
> 
> 1. What `lang` identifier(s) should plain text use?
> 2. What comment rules and markup marker(s) should plain text use?

1. Either "text" or _none_  
2. Right now, it defaults to `//` which is OK, but `#` might be better.

Maybe too late for now, allow a new attribute to specify the markup "prefix"  (`//`, `#`, `!`, etc)

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PR: https://git.openjdk.java.net/jdk/pull/6397