[gtk+] scrolledwindow: Bug 766569 - Report child natural size unconditionally

[Tristan Van Berkom <tvb src gnome org>]

commit 0943c9f6b2c3ad5827ae5d8f3742f75e72782e41
Author: Tristan Van Berkom <tristan vanberkom codethink co uk>
Date:   Sat Jun 4 20:57:23 2016 +0900

    scrolledwindow: Bug 766569 - Report child natural size unconditionally
    
    This patch causes the scrolled window default behavior to change in
    such a way that the natural size request of the child is unconditionally
    reported, which probably should have been the case since day 1.
    
    This should not cause significant fallout since a scrolled window is
    normally used to expand/fill, eating up remaining space for scrollable
    content - it will however cause the scrolled window to compete for
    additional space with siblings, proportionally to the size of the
    scrolled window's content.

 gtk/gtkscrolledwindow.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 1ef826b..c6a9ca4 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -1781,17 +1781,18 @@ gtk_scrolled_window_measure (GtkCssGadget   *gadget,
                                           &min_child_size,
                                           &nat_child_size);
 
+         natural_req.width += nat_child_size;
+
          if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
            {
              minimum_req.width += min_child_size;
-             natural_req.width += nat_child_size;
            }
          else
            {
              if (priv->min_content_width >= 0)
                {
                  minimum_req.width += priv->min_content_width;
-                 natural_req.width += priv->min_content_width;
+                 natural_req.width  = MAX (priv->min_content_width, natural_req.width);
                  extra_width = -1;
                }
 
@@ -1822,17 +1823,18 @@ gtk_scrolled_window_measure (GtkCssGadget   *gadget,
                                            &min_child_size,
                                            &nat_child_size);
 
+         natural_req.height += nat_child_size;
+
          if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
            {
              minimum_req.height += min_child_size;
-             natural_req.height += nat_child_size;
            }
          else
            {
              if (priv->min_content_height >= 0)
                {
                  minimum_req.height += priv->min_content_height;
-                 natural_req.height += priv->min_content_height;
+                 natural_req.height  = MAX (priv->min_content_height, natural_req.height);
                  extra_height = -1;
                }