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* desktop: prevent duplicate launches Acquires a file lock and listens on a loopback ServerSocket in dataDir. A second launch signals the running instance to restore its window and exits silently. See plans/2026-05-13-desktop-single-instance.md. * desktop: un-minimize window in showWindow toFront() does not un-minimize a JFrame on any AWT platform. Clear the ICONIFIED bit so a minimized window restores; preserves MAXIMIZED_BOTH. Also fixes the same case when restoring from the tray icon. * desktop: move showWindow from DesktopTray to DesktopApp It has callers outside the tray (single-instance signal) and belongs next to simplexWindowState, which it operates on. * simplify * refactor * desktop: start show-file watcher when choosing minimize from first-close dialog The handleCloseRequest path already starts the watcher when minimizing to tray; the Ask-dialog path did not, so the first-time user who picks "Minimize to tray" got a hidden window with no signal handling — a duplicate launch would not restore it. * desktop: always watch for duplicate-launch signal, drop hung-instance alert The watcher now runs for the JVM lifetime once the lock is acquired, not only when minimized to tray. Duplicate launches always restore the primary's window (un-minimize, un-tray-hide, toFront) instead of being silently dropped when the primary is not minimized. Drops the "may be hung, start anyway?" popup and the two strings — that fallback was needed only because the watcher could miss signals. With the always-on watcher there is no scenario where the primary fails to consume simplex.show, so the escape hatch becomes dead code. * desktop: alert when primary's watcher doesn't consume the show file Restores the "another instance may be running" alert. Every duplicate launch waits up to 1s for the primary's watcher to delete the show file it just created. If the file is consumed within the window, the duplicate exits silently. If still there after 1s the primary is hung and the alert fires. --------- Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>