shell-global: Place launched applications into a systemd scope

This improves separation from the shells service scope for applications
launched using an XDG desktop file.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/863

src/shell-global.c

@@ -29,6 +29,9 @@
 #include <meta/meta-workspace-manager.h>
 #include <meta/meta-x11-display.h>
 
+#define GNOME_DESKTOP_USE_UNSTABLE_API
+#include <libgnome-desktop/gnome-systemd.h>
+
 /* Memory report bits */
 #ifdef HAVE_MALLINFO
 #include <malloc.h>
@@ -43,6 +46,7 @@
 #include "shell-perf-log.h"
 #include "shell-window-tracker.h"
 #include "shell-wm.h"
+#include "shell-util.h"
 #include "st.h"
 
 static ShellGlobal *the_object = NULL;
@@ -1308,6 +1312,30 @@ shell_global_get_current_time (ShellGlobal *global)
   return clutter_get_current_event_time ();
 }
 
+static void
+shell_global_app_launched_cb (GAppLaunchContext *context,
+                              GAppInfo          *info,
+                              GVariant          *platform_data,
+                              gpointer           user_data)
+{
+  gint32 pid;
+  const gchar *app_name;
+
+  if (!g_variant_lookup (platform_data, "pid", "i", &pid))
+    return;
+
+  app_name = g_app_info_get_id (info);
+  if (app_name == NULL)
+    app_name = g_app_info_get_executable (info);
+
+  /* Start async request; we don't care about the result */
+  gnome_start_systemd_scope (app_name,
+                             pid,
+                             NULL,
+                             NULL,
+                             NULL, NULL, NULL);
+}
+
 /**
  * shell_global_create_app_launch_context:
  * @global: A #ShellGlobal
@@ -1343,6 +1371,11 @@ shell_global_create_app_launch_context (ShellGlobal *global,
 
   meta_launch_context_set_workspace (context, ws);
 
+  g_signal_connect (context,
+                    "launched",
+                    G_CALLBACK (shell_global_app_launched_cb),
+                    NULL);
+
   return (GAppLaunchContext *) context;
 }