[gtk+] scrolledwindow: Fix typo in get_preferred_height calculation

[Debarshi Ray <debarshir src gnome org>]

commit df98140e8e0fcd9727622ba0b296a0932c70e493
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon May 16 21:13:14 2016 +0200

    scrolledwindow: Fix typo in get_preferred_height calculation
    
    When we are beginning to calculate the height, if the vscrollbar_policy
    is not GTK_POLICY_NEVER, and there is no min-content-height, then we
    need some small non-zero value to get started. The idea is to always
    ask for at least enough to fit the horizontal scrollbar.
    
    Simply put, this should be the mirror image of the corresponding width
    calculation code.
    
    Those who got used to the buggy behaviour might notice that their
    GtkScrolledWindows are not as tall as they used to be.
    
    Fall out from 55196a705f00564a44647bfc97981db0a783369a
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766530

 gtk/gtkscrolledwindow.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 2f2b802..884e377 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -1787,10 +1787,10 @@ gtk_scrolled_window_measure (GtkCssGadget   *gadget,
                  natural_req.height = MAX (natural_req.height, priv->min_content_height);
                  extra_height = -1;
                }
-             else if (policy_may_be_visible (priv->vscrollbar_policy) && !priv->use_indicators)
+             else if (policy_may_be_visible (priv->hscrollbar_policy) && !priv->use_indicators)
                {
-                 minimum_req.height += vscrollbar_requisition.height;
-                 natural_req.height += vscrollbar_requisition.height;
+                 minimum_req.height += hscrollbar_requisition.height;
+                 natural_req.height += hscrollbar_requisition.height;
                }
            }
        }