[evince] view: ignore higher mouse buttons on links

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 812eeeecb3da18ff8369cd3571169bee1f9cec9a
Author: Jason Crain <jcrain src gnome org>
Date:   Thu Jun 20 00:29:36 2019 -0600

    view: ignore higher mouse buttons on links
    
    Currently, releasing the mouse forward and back buttons over a link will
    follow the link. Since these buttons are used for history navigation,
    this can result in unexpectedly following a link. Only process primary
    and secondary button release events for links.
    
    Fixes #1152

 libview/ev-view.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 6bb8de2d..21c29804 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -5924,7 +5924,9 @@ ev_view_button_release_event (GtkWidget      *widget,
                                       (GSourceFunc)ev_view_scroll_drag_release, view);
        }
 
-       if (view->document && !view->drag_info.in_drag && view->pressed_button != 3) {
+       if (view->document && !view->drag_info.in_drag &&
+           (view->pressed_button == GDK_BUTTON_PRIMARY ||
+            view->pressed_button == GDK_BUTTON_MIDDLE)) {
                link = ev_view_get_link_at_location (view, event->x, event->y);
        }