[evince] Prevent jumps to last page when autoscrolling

[Marek Kašík <mkasik src gnome org>]

commit e983e168d034215fdf476f4f16b749a020b14429
Author: Marek Kasik <mkasik redhat com>
Date:   Tue May 20 16:12:52 2014 +0200

    Prevent jumps to last page when autoscrolling
    
    It can happen during autoscrolling that current page is set to the last one
    when you are moving towards beginning of the document and crosses toolbar
    above the document.
    This happens due to filling of unsigned integer "scroll_info.last_y"
    with negative value.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=725389

 libview/ev-view.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 7618bbd..57acbf1 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -4964,7 +4964,8 @@ ev_view_motion_notify_event (GtkWidget      *widget,
        }
 
        if (view->scroll_info.autoscrolling) {
-               view->scroll_info.last_y = y;
+               if (y >= 0)
+                       view->scroll_info.last_y = y;
                return TRUE;
        }