RFR: Support preview features in libraries

[Chen Liang]

On Wed, 4 Feb 2026 16:44:19 GMT, Dan Smith <dlsmith at openjdk.org> wrote:

> Always allow preview class files, compile standard libs with --enable-preview

src/jdk.jpackage/share/classes/jdk/jpackage/internal/CfgFile.java line 132:

> 130:             this.appModsDirectory = appModsDirectory;
> 131:             super();
> 132:             if (!appModsDirectory.startsWith(appDirectory())) {

Let's make `appDirectory` static instead.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/2037#discussion_r2764997752