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Add stderr filtering and redirection for GTK messages

Laksono Adhiantorequested to merge
adhianto/hpcviewer:feature-stderr-filter into main

This change introduces a structured mechanism to capture and filter specific stderr messages (e.g., GTK warnings) in the hpcviewer launcher.

  • Added StderrFilter to filter and log stderr lines matching configurable patterns (in this case "Gtk-" warnings/errors/critical).
  • Added NativeStdioRedirector (Linux only) that uses pipe() + dup2() via the Java Foreign Function & Memory API (JDK 22+) to redirect native stderr output into a filter stream:
    • A single daemon thread reads from the redirected stderr pipe to prevent blocking or deadlocks, as required by Unix pipes.
    • On non-Linux systems, native redirection is skipped (harmless since SWT only uses GTK on Linux)
  • Provides log file output with timestamped entries for matched lines.
  • Added unit tests (StderrFilterTest) for the filtering logic

Compatibility issues:

  • Requires Java 22 or newer due to Java FFM (foreign function & memory)

Signed-off-by: Laksono Adhianto laksono@gmail.com

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