RFR: 8271356: Modify jdb to treat an empty command as a repeat of the previous command [v5]

[Jakob Cornell]

On Thu, 23 Sep 2021 15:24:47 GMT, Jakob Cornell <duke at openjdk.java.net> wrote:

>> This has been under discussion on and off for the past month or so on serviceability-dev, and I think a CSR request is required, so this may be a work in progress.
>> 
>> Notes on the patch:
>> 
>> - The `list` command previously marked a line in each listing with `=>`.  In a bare `list` this is the next line up for execution.  Previously when requesting a specific location (e.g. `list 5`) the requested line would be marked.  With the patch applied, `list` will only ever mark the next line up for execution.  This is consistent with the behavior of GDB and PDB (at least).
>> - `EOF` is printed when the repeat setting is on and a bare `list` command follows a listing containing the last source line.  This feature is from PDB; it's a somewhat softer message than the one for an explicit `list` request that's out of range.
>> - I don't speak Chinese or Japanese, so I've omitted localizations for the new messages in those locales.  However, I updated the help text in both to include the new commands, with the descriptions left empty for now.
>
> Jakob Cornell has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8271356: Invoke auto-advance on empty input after targeted list command

Yep, making those changes without reformatting the files was a big pain.  I've reverted the changes for now as Chris suggested.  Thanks for the input, Ioi and Chris.

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PR: https://git.openjdk.java.net/jdk/pull/5290