[Feature]: put cursor to next/previous file in trouble list

[younger-1]

In workspace_diagnostics mode, there may have multiple file in troubls's list. It will be nice to use J and K to put cursor to next file and previous file, which I found useful when looking through all my diagnostics.

[younger-1]

The behavior is like nvim-bqf's prevfile and nextfile.

[folke]

Development on the main branch is EOL.

Trouble has been rewritten and will be merged in main soon.

This issue/feature either no longer exists or has been implemented on dev.

For more info, see https://github.com/folke/trouble.nvim/tree/dev