[gtk+] GtkScrolledWindow: Don't handle key event when can't scroll

[Marek Kašík <mkasik src gnome org>]

commit 359534ee59aa0572ca2bba2c509b93682ff5beeb
Author: Marek Kasik <mkasik redhat com>
Date:   Wed Aug 5 11:14:39 2015 +0200

    GtkScrolledWindow: Don't handle key event when can't scroll
    
    Don't return that a key event was handled when the corresponding
    scrollbar can not scroll.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=753256

 gtk/gtkscrolledwindow.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index a56844f..1c85362 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -2463,9 +2463,19 @@ gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
     }
 
   if (horizontal)
-    adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
+    {
+      if (may_hscroll (scrolled_window))
+        adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
+      else
+        return FALSE;
+    }
   else
-    adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
+    {
+      if (may_vscroll (scrolled_window))
+        adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
+      else
+        return FALSE;
+    }
 
   if (adjustment)
     {