[eog] Add additional key codes for image switching using mouse buttons

[Felix Riemann <friemann src gnome org>]

commit b23508382f0131d9961e437fe8c8453adeb84faa
Author: Felix Riemann <friemann gnome org>
Date:   Sat Oct 13 14:12:38 2012 +0200

    Add additional key codes for image switching using mouse buttons
    
    This should re-establish that function for newer X setups.
    As we don't know whether the old keycodes could still occur,
    we simply keep for compatibility.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=684179

 src/eog-window.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/eog-window.c b/src/eog-window.c
index e24ff18..f5c37df 100644
--- a/src/eog-window.c
+++ b/src/eog-window.c
@@ -5062,14 +5062,19 @@ eog_window_button_press (GtkWidget *widget, GdkEventButton *event)
 	EogWindow *window = EOG_WINDOW (widget);
 	gint result = FALSE;
 
+	/* We currently can't tell whether the old button codes (6, 7) are
+	 * still in use. So we keep them in addition to the new ones (8, 9)
+	 */
 	if (event->type == GDK_BUTTON_PRESS) {
 		switch (event->button) {
 		case 6:
+		case 8:
 			eog_thumb_view_select_single (EOG_THUMB_VIEW (window->priv->thumbview),
 						      EOG_THUMB_VIEW_SELECT_LEFT);
 			result = TRUE;
 		       	break;
 		case 7:
+		case 9:
 			eog_thumb_view_select_single (EOG_THUMB_VIEW (window->priv->thumbview),
 						      EOG_THUMB_VIEW_SELECT_RIGHT);
 			result = TRUE;