[gthumb] grid view: activate smooth scrolling to get the overshoot effect

[Paolo Bacchilega <paobac src gnome org>]

commit a92d3cb10a51f94786356563d1fe510126714b90
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Jul 1 19:28:32 2017 +0200

    grid view: activate smooth scrolling to get the overshoot effect

 gthumb/gth-grid-view.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gthumb/gth-grid-view.c b/gthumb/gth-grid-view.c
index 800acb5..828afa1 100644
--- a/gthumb/gth-grid-view.c
+++ b/gthumb/gth-grid-view.c
@@ -1043,6 +1043,7 @@ gth_grid_view_realize (GtkWidget *widget)
        attributes.height = MAX (self->priv->height, allocation.height);
        attributes.event_mask = (GDK_EXPOSURE_MASK
                                 | GDK_SCROLL_MASK
+                                | GDK_SMOOTH_SCROLL_MASK
                                 | GDK_POINTER_MOTION_MASK
                                 | GDK_ENTER_NOTIFY_MASK
                                 | GDK_LEAVE_NOTIFY_MASK