From 759ff8281f27a0c0a63b33ffb4e2aa4066429198 Mon Sep 17 00:00:00 2001
From: Adrian Vovk <adrianvovk@gmail.com>
Date: Thu, 18 Sep 2025 23:55:19 -0400
Subject: [PATCH] manager: Support save/restore setting

We're adding a toggle to gnome-control-center that lets you disable the
session save/restore feature. This hooks up gnome-session to respect the
setting.
---
 gnome-session/gsm-manager.c                |  6 +++++
 gnome-session/gsm-session-save.c           | 31 ++++++++++++++++++++++
 gnome-session/gsm-session-save.h           |  1 +
 gnome-session/org.gnome.SessionManager.xml |  7 +++++
 4 files changed, 45 insertions(+)

diff --git a/gnome-session/gsm-manager.c b/gnome-session/gsm-manager.c
index e8abf601..fecde253 100644
--- a/gnome-session/gsm-manager.c
+++ b/gnome-session/gsm-manager.c
@@ -60,6 +60,7 @@
 
 #define SESSION_SCHEMA            "org.gnome.desktop.session"
 #define KEY_IDLE_DELAY            "idle-delay"
+#define KEY_SAVE_RESTORE          "save-restore"
 
 #define GSM_MANAGER_SCHEMA        "org.gnome.SessionManager"
 #define KEY_LOGOUT_PROMPT         "logout-prompt"
@@ -859,6 +860,7 @@ _gsm_manager_set_active_session (GsmManager *manager,
         if (!is_kiosk)
                 manager->session_save = gsm_session_save_new (session_name);
 
+        gsm_exported_manager_set_restore_supported (manager->skeleton, manager->session_save != NULL);
         gsm_exported_manager_set_session_name (manager->skeleton, session_name);
 }
 
@@ -2215,6 +2217,10 @@ handle_end_session_dialog_confirmation (GsmManager           *manager,
         else if (manager->logout_type != confirmed_logout_type)
                 g_warning ("GsmManager: Shell confirmed unexpected logout type");
 
+        if (manager->session_save &&
+            !g_settings_get_boolean (manager->session_settings, KEY_SAVE_RESTORE))
+                gsm_session_save_discard (manager->session_save);
+
         manager->logout_mode = GSM_MANAGER_LOGOUT_MODE_FORCE;
         manager->logout_type = confirmed_logout_type;
         end_phase (manager);
diff --git a/gnome-session/gsm-session-save.c b/gnome-session/gsm-session-save.c
index 034c7716..49ee1e34 100644
--- a/gnome-session/gsm-session-save.c
+++ b/gnome-session/gsm-session-save.c
@@ -714,6 +714,37 @@ gsm_session_save_unregister (GsmSessionSave *save,
         return TRUE;
 }
 
+static gboolean
+free_if_not_crashed (SavedAppInstance *instance,
+                     SavedApp *app)
+{
+        /* Remember instances of crashed apps, so that we communicate the right
+         * restore reason on next launch */
+        if (instance->crash_state == CRASH_STATE_INSTANCE_CRASHED)
+                return FALSE;
+
+        saved_app_discard_instance (app, instance);
+        saved_app_instance_free (instance);
+        return TRUE;
+}
+
+void
+gsm_session_save_discard (GsmSessionSave *save)
+{
+        GHashTableIter iter;
+        gpointer value;
+
+        g_hash_table_iter_init (&iter, save->apps);
+        while (g_hash_table_iter_next (&iter, NULL, &value)) {
+                SavedApp *app = value;
+                app->instances = remove_all_predicate (app->instances,
+                                                       (DestroyPredicate) free_if_not_crashed,
+                                                       app);
+        }
+
+        flush_to_disk (save);
+}
+
 GsmSessionSave *
 gsm_session_save_new (const char *session_id)
 {
diff --git a/gnome-session/gsm-session-save.h b/gnome-session/gsm-session-save.h
index 15c0c8ec..82ee61cb 100644
--- a/gnome-session/gsm-session-save.h
+++ b/gnome-session/gsm-session-save.h
@@ -34,5 +34,6 @@ void            gsm_session_save_deleted_ids (GsmSessionSave     *save,
 gboolean        gsm_session_save_unregister  (GsmSessionSave     *save,
                                               const char         *app_id,
                                               const char         *instance_id);
+void     gsm_session_save_discard            (GsmSessionSave *save);
 
 G_END_DECLS
diff --git a/gnome-session/org.gnome.SessionManager.xml b/gnome-session/org.gnome.SessionManager.xml
index a5cf3fc4..1a5bec6c 100644
--- a/gnome-session/org.gnome.SessionManager.xml
+++ b/gnome-session/org.gnome.SessionManager.xml
@@ -453,5 +453,12 @@
     -->
     <property name="InhibitedActions" type="u" access="read"/>
 
+    <!--
+      RestoreSupported:
+
+      Communicates whether the session supports the save/restore mechanism.
+    -->
+    <property name="RestoreSupported" type="b" access="read"/>
+
   </interface>
 </node>
-- 
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