[gnome-games] ui: Prepare the display page before displaying an error

[Adrien Plazas <aplazas src gnome org>]

commit 65e904e2bf7e71a8ad95a02d4fab4bade7cea5c2
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Feb 17 15:49:27 2017 +0100

    ui: Prepare the display page before displaying an error
    
    Ensure the error page is in a good state when displaying an error.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778774

 src/ui/application-window.vala |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)
---
diff --git a/src/ui/application-window.vala b/src/ui/application-window.vala
index 4ce8fd7..f62d707 100644
--- a/src/ui/application-window.vala
+++ b/src/ui/application-window.vala
@@ -214,11 +214,7 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
 
                // Reset the UI parts depending on the runner to avoid an
                // inconsistent state is case we couldn't retrieve it.
-               display_header_bar.can_fullscreen = false;
-               display_box.header_bar.can_fullscreen = false;
-               display_box.runner = null;
-               display_header_bar.media_set = null;
-               display_box.header_bar.media_set = null;
+               reset_display_page ();
 
                var runner = try_get_runner (game);
                if (runner == null)
@@ -245,12 +241,14 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
                        if (runner.check_is_valid (out error_message))
                                return runner;
 
+                       reset_display_page ();
                        display_box.display_running_game_failed (game, error_message);
 
                        return null;
                }
                catch (Error e) {
                        warning (e.message);
+                       reset_display_page ();
                        display_box.display_running_game_failed (game, _("An unexpected error occured."));
 
                        return null;
@@ -490,4 +488,12 @@ private class Games.ApplicationWindow : Gtk.ApplicationWindow {
                inhibit_cookie = new_cookie;
                inhibit_flags = new_flags;
        }
+
+       private void reset_display_page () {
+               display_header_bar.can_fullscreen = false;
+               display_box.header_bar.can_fullscreen = false;
+               display_box.runner = null;
+               display_header_bar.media_set = null;
+               display_box.header_bar.media_set = null;
+       }
 }