Always start session on successful auth

data/lightdm-gtk-greeter.conf

@@ -28,6 +28,7 @@
 #  hide-user-image = false|true ("false" by default)
 #  round-user-image = false|true ("true" by default)
 #  highlight-logged-user  = false|true ("true" by default)
+#  pam-autologin = false|true ("false" by default) Whether the currently selected user should be logged in automatically, once a PAM auth succeeds.
 #
 # Panel:
 #  panel-position = top|bottom ("top" by default)

src/greeterconfiguration.h

@@ -32,6 +32,7 @@
 #define CONFIG_KEY_DEFAULT_USER_IMAGE   "default-user-image"
 #define CONFIG_KEY_ROUND_USER_IMAGE     "round-user-image"
 #define CONFIG_KEY_HIGHLIGHT_LOGGED_USER "highlight-logged-user"
+#define CONFIG_KEY_PAM_AUTOLOGIN        "pam-autologin"
 #define CONFIG_KEY_KEYBOARD             "keyboard"
 #define CONFIG_KEY_KEYBOARD_LAYOUTS     "keyboard-layouts"
 #define CONFIG_KEY_READER               "reader"

src/lightdm-gtk-greeter.c

@@ -2622,12 +2622,16 @@ authentication_complete_cb (LightDMGreeter *ldm)
 
     if (lightdm_greeter_get_is_authenticated (ldm))
     {
-        if (prompted)
+        if (config_get_bool (NULL, CONFIG_KEY_PAM_AUTOLOGIN, FALSE)) {
             start_session ();
-        else
-        {
-            gtk_widget_hide (GTK_WIDGET (password_entry));
-            gtk_widget_grab_focus (GTK_WIDGET (user_combo));
+        } else {
+            if (prompted)
+                start_session ();
+            else
+            {
+                gtk_widget_hide (GTK_WIDGET (password_entry));
+                gtk_widget_grab_focus (GTK_WIDGET (user_combo));
+            }
         }
     }
     else