[recipes] Support mouse forward/back buttons

[Matthias Clasen <matthiasc src gnome org>]

commit 549d1115706592d858d39c1eb9f1a302a8a77081
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Feb 23 16:32:40 2017 -0500

    Support mouse forward/back buttons
    
    Just since we can.

 src/gr-cooking-page.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/src/gr-cooking-page.c b/src/gr-cooking-page.c
index e6c36f3..421a281 100644
--- a/src/gr-cooking-page.c
+++ b/src/gr-cooking-page.c
@@ -399,7 +399,17 @@ gr_cooking_page_handle_event (GrCookingPage *page,
         else if (event->type == GDK_BUTTON_PRESS) {
                 GdkEventButton *e = (GdkEventButton *)event;
 
-                if (e->button == GDK_BUTTON_SECONDARY) {
+                if (e->button == 8) {
+                        prev_step (page);
+
+                        return GDK_EVENT_STOP;
+                }
+                else if (e->button == 9) {
+                        next_step (page);
+
+                        return GDK_EVENT_STOP;
+                }
+                else if (e->button == GDK_BUTTON_SECONDARY) {
                         stop_cooking (page);
 
                         return GDK_EVENT_STOP;