file-operations: Remove blocking dialog for emptying trash

Stop using the blocking dialog function `gtk_dialog_run`
when the user is prompted to empty the trash during unmount.

Part of #1992

src/nautilus-file-operations.c

@@ -3011,11 +3011,9 @@ has_trash_files (GMount *mount)
     return res;
 }
 
-
-static gint
-prompt_empty_trash (GtkWindow *parent_window)
+static GtkWidget *
+create_empty_trash_prompt (GtkWindow *parent_window)
 {
-    gint result;
     GtkWidget *dialog;
 
     dialog = gtk_message_dialog_new (parent_window, GTK_DIALOG_MODAL,
@@ -3035,9 +3033,7 @@ prompt_empty_trash (GtkWindow *parent_window)
     gtk_window_set_title (GTK_WINDOW (dialog), "");
     atk_object_set_role (gtk_widget_get_accessible (dialog), ATK_ROLE_ALERT);
 
-    result = gtk_dialog_run (GTK_DIALOG (dialog));
-    gtk_widget_destroy (dialog);
-    return result;
+    return dialog;
 }
 
 static void
@@ -3048,6 +3044,42 @@ empty_trash_for_unmount_done (gboolean success,
     do_unmount (data);
 }
 
+static void
+empty_trash_prompt_cb (GtkDialog *dialog,
+                       gint       response_id,
+                       gpointer   user_data)
+{
+    UnmountData *data = user_data;
+
+    if (response_id == GTK_RESPONSE_ACCEPT)
+    {
+        GTask *task;
+        EmptyTrashJob *job;
+
+        job = op_job_new (EmptyTrashJob, data->parent_window, NULL);
+        job->should_confirm = FALSE;
+        job->trash_dirs = get_trash_dirs_for_mount (data->mount);
+        job->done_callback = empty_trash_for_unmount_done;
+        job->done_callback_data = data;
+
+        task = g_task_new (NULL, NULL, empty_trash_task_done, job);
+        g_task_set_task_data (task, job, NULL);
+        g_task_run_in_thread (task, empty_trash_thread_func);
+        g_object_unref (task);
+    }
+    else if (response_id == GTK_RESPONSE_CANCEL)
+    {
+        if (data->callback)
+        {
+            data->callback (data->callback_data);
+        }
+
+        unmount_data_free (data);
+    }
+
+    gtk_widget_destroy (GTK_WIDGET (dialog));
+}
+
 void
 nautilus_file_operations_unmount_mount_full (GtkWindow               *parent_window,
                                              GMount                  *mount,
@@ -3058,7 +3090,6 @@ nautilus_file_operations_unmount_mount_full (GtkWindow               *parent_win
                                              gpointer                 callback_data)
 {
     UnmountData *data;
-    int response;
 
     data = g_new0 (UnmountData, 1);
     data->callback = callback;
@@ -3078,35 +3109,12 @@ nautilus_file_operations_unmount_mount_full (GtkWindow               *parent_win
 
     if (check_trash && has_trash_files (mount))
     {
-        response = prompt_empty_trash (parent_window);
-
-        if (response == GTK_RESPONSE_ACCEPT)
-        {
-            GTask *task;
-            EmptyTrashJob *job;
-
-            job = op_job_new (EmptyTrashJob, parent_window, NULL);
-            job->should_confirm = FALSE;
-            job->trash_dirs = get_trash_dirs_for_mount (mount);
-            job->done_callback = empty_trash_for_unmount_done;
-            job->done_callback_data = data;
-
-            task = g_task_new (NULL, NULL, empty_trash_task_done, job);
-            g_task_set_task_data (task, job, NULL);
-            g_task_run_in_thread (task, empty_trash_thread_func);
-            g_object_unref (task);
-            return;
-        }
-        else if (response == GTK_RESPONSE_CANCEL)
-        {
-            if (callback)
-            {
-                callback (callback_data);
-            }
+        GtkWidget *dialog;
+        dialog = create_empty_trash_prompt (parent_window);
 
-            unmount_data_free (data);
-            return;
-        }
+        g_signal_connect (dialog, "response", G_CALLBACK (empty_trash_prompt_cb), data);
+        gtk_widget_show_all (dialog);
+        return;
     }
 
     do_unmount (data);