RFR: 8375323: Improve handling of the "--app-content" and "--input" options in jpackage

[Alexey Semenyuk]

On Tue, 13 Jan 2026 15:11:37 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Change how the values of the "--app-content", "--input", and "--mac-dmg-content" options are handled. Traverse the input directories during the configuration phase, before jpackage creates any output, rather than during the packaging phase.
> 
> This change required rework of the cli package to support converting values of any type to any type (`T -> T2`). Previously, it supported only String converters (`String -> T`).

@sashamatveev PTAL

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PR Comment: https://git.openjdk.org/jdk/pull/29194#issuecomment-3750327215