online-accounts: Track the lifecycle of CcGoaPanel across async calls

Due to an API bug in GNOME Online Accounts, the asynchronous
goa_provider_get_all method doesn't accept a GCancellable argument.
This makes it difficult to cancel an ongoing call when the CcGoaPanel
gets destroyed.

Prior to commit c26f8ae018900a55, this was hacked around by taking a
reference on the panel for the duration of the call. Instead of
cancelling a pending call on destruction, it would keep the panel alive
until the call was over. However, that was lost during commit
c26f8ae018900a55.

One thing to bear in mind is that GtkWidgets, CcGoaPanel is one, can
be destroyed by a gtk_widget_destroy call, which is subtly different
than a simple sequence of g_object_unref calls. When gtk_widget_destroy
is used, it invokes the GObject::dispose virtual method of the widget.
It is expected this will cause anything holding a reference to this
widget to drop their references, leading to GObject::finalize being
called. However, there is no guarantee that this will happen in the
same iteration of the GMainLoop. Therefore, it is possible that when
the goa_provider_get_all call finishes, the CcGoaPanel might be in a
disposed, but not yet finalized state.

When a GObject is in a disposed-but-not-finalized state, only a very
limited number of operations can be performed on it. Its reference
count can be altered, the memory used by the instance struct can be
accessed, but none of the member GObjects can be assumed to be valid.
eg., it's definitely illegal to add new rows to the member GtkListBox.
Hence a boolean flag is used to mark the destroyed state of the panel.

This second part is a small improvement over the earlier hack.

https://gitlab.gnome.org/GNOME/gnome-control-center/issues/208

1 files changed, 8 insertions, 2 deletions

diff --git a/panels/online-accounts/cc-online-accounts-panel.c b/panels/online-accounts/cc-online-accounts-panel.c
index a89d249c0..747381bef 100644
--- a/panels/online-accounts/cc-online-accounts-panel.c
+++ b/panels/online-accounts/cc-online-accounts-panel.c
@@ -56,6 +56,7 @@ struct _CcGoaPanel
   GtkWidget *stack;
   GtkWidget *accounts_vbox;
 
+  gboolean   destroyed;
   guint      remove_account_timeout_id;
 };
 
@@ -394,6 +395,8 @@ cc_goa_panel_dispose (GObject *object)
   /* Must be destroyed in dispose, not finalize. */
   g_clear_pointer (&panel->edit_account_dialog, gtk_widget_destroy);
 
+  panel->destroyed = TRUE;
+
   G_OBJECT_CLASS (cc_goa_panel_parent_class)->dispose (object);
 }
 
@@ -489,7 +492,7 @@ cc_goa_panel_init (CcGoaPanel *panel)
                     panel);
 
   fill_accounts_listbox (panel);
-  goa_provider_get_all (get_all_providers_cb, panel);
+  goa_provider_get_all (get_all_providers_cb, g_object_ref_sink (panel));
 
   gtk_widget_show (GTK_WIDGET (panel));
 }
@@ -852,7 +855,7 @@ get_all_providers_cb (GObject      *source,
                       GAsyncResult *res,
                       gpointer      user_data)
 {
-  CcGoaPanel *self = user_data;
+  g_autoptr (CcGoaPanel) self = user_data;
   GList *providers;
   GList *l;
 
@@ -860,6 +863,9 @@ get_all_providers_cb (GObject      *source,
   if (!goa_provider_get_all_finish (&providers, res, NULL))
     return;
 
+  if (self->destroyed)
+    return;
+
   for (l = providers; l != NULL; l = l->next)
     {
       GoaProvider *provider;