RFR: 8356218: [macos] Document --app-content

[Alexey Semenyuk]

On Tue, 19 Aug 2025 20:07:10 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

> - Added following note for `--app-content` on macOS to help and man page: `The value should be a directory with the "Resources" subdirectory (or any other directory that is valid in the "Contents" directory of the application bundle). Otherwise, jpackage may produce invalid application bundle which may fail code signing and/or notarization.`
> - Added warning if `--app-content` if it points to non-standard subdirectory in "Contents" directory.
> - Added test to cover warning message.

src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/MacApplicationBuilder.java line 133:

> 131:             if (!CONTENTS_SUB_DIRS.stream()
> 132:                     .anyMatch(subDir -> contentDir.getFileName().toString()
> 133:                                                   .equalsIgnoreCase(subDir))) {

Why case-insensitive path name comparison on Unix?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26848#discussion_r2286356298