nwg-panel: fix multiple instances on display change

hosts/common/programs/nwg-panel/default.nix

@@ -147,7 +147,6 @@ in
     suggestedPrograms = [
       "brightnessctl"
       "pactl"  # pactl required by `per-app-volume` component.
-      "sane-die-with-parent"
     ] ++ lib.optionals (cfg.config.torch != null) [
       "torch-toggle"
     ];
@@ -205,6 +204,7 @@ in
       "/sys/devices"
     ];
     sandbox.extraRuntimePaths = [ "sway" ];
+    sandbox.isolatePids = false;  #< nwg-panel restarts itself on display dis/connect, by killing all other instances.
 
     services.nwg-panel = {
       description = "nwg-panel status/topbar for wayland";
@@ -214,7 +214,7 @@ in
       # N.B.: G_MESSAGES_DEBUG=all causes the swaync icon to not render
       # command = "env G_MESSAGES_DEBUG=all nwg-panel";
       # XXX: try `nwg-panel & ; kill $$`. the inner nwg-panel doesn't die (without sane-die-with-parent), and hence the service would be prone to maintaining _multiple_ bars.
-      command = "sane-die-with-parent --descendants --signal SIGKILL nwg-panel";
+      command = "nwg-panel";
     };
   };
 }