[gtk+/gtk-3-4] iconview: gtk_icon_view_compute_n_items_for_size bugfix

[Benjamin Otte <otte src gnome org>]

commit 99a6b4ffa89d97bf0ee29cdd5dec96189e3e45ef
Author: Hans de Goede <hdegoede redhat com>
Date:   Tue Jun 12 17:39:50 2012 +0200

    iconview: gtk_icon_view_compute_n_items_for_size bugfix
    
    While working on the "iconview: Don't shrink items" patch I noticed that
    gtk_icon_view_compute_n_items_for_size modifies the natural and minimum
    item sizes it got from gtk_icon_view_get_preferred_item_size when
    calculating the max number of items which will fit, but later on it
    checks against these sizes when calculating the item_size, and these
    checks expect these values to be unmodified.
    
    This patch fixes this by modifying the natural and minimum values in
    advance and doing all computations with modified values.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=677809

 gtk/gtkiconview.c |   33 ++++++++++-----------------------
 1 files changed, 10 insertions(+), 23 deletions(-)
---
diff --git a/gtk/gtkiconview.c b/gtk/gtkiconview.c
index a451735..55c7d80 100644
--- a/gtk/gtkiconview.c
+++ b/gtk/gtkiconview.c
@@ -1515,19 +1515,23 @@ gtk_icon_view_compute_n_items_for_size (GtkIconView    *icon_view,
                                         gint           *max_item_size)
 {
   GtkIconViewPrivate *priv = icon_view->priv;
-  int minimum, natural;
+  int minimum, natural, spacing;
 
   g_return_if_fail (min_item_size == NULL || min_items != NULL);
   g_return_if_fail (max_item_size == NULL || max_items != NULL);
 
   gtk_icon_view_get_preferred_item_size (icon_view, orientation, -1, &minimum, &natural);
 
-  size -= 2 * priv->margin;
   if (orientation == GTK_ORIENTATION_HORIZONTAL)
-    size += priv->column_spacing;
+    spacing = priv->column_spacing;
   else
-    size += priv->row_spacing;
+    spacing = priv->row_spacing;
   
+  size -= 2 * priv->margin;
+  size += spacing;
+  minimum += spacing;
+  natural += spacing;
+
   if (priv->columns > 0)
     {
       if (orientation == GTK_ORIENTATION_HORIZONTAL)
@@ -1549,17 +1553,6 @@ gtk_icon_view_compute_n_items_for_size (GtkIconView    *icon_view,
     }
   else
     {
-      if (orientation == GTK_ORIENTATION_HORIZONTAL)
-        {
-          minimum += priv->column_spacing;
-          natural += priv->column_spacing;
-        }
-      else
-        {
-          minimum += priv->row_spacing;
-          natural += priv->row_spacing;
-        }
-
       if (max_items)
         {
           if (size <= minimum)
@@ -1580,22 +1573,16 @@ gtk_icon_view_compute_n_items_for_size (GtkIconView    *icon_view,
   if (min_item_size)
     {
       *min_item_size = size / *min_items;
-      if (orientation == GTK_ORIENTATION_HORIZONTAL)
-        *min_item_size -= priv->column_spacing;
-      else
-        *min_item_size -= priv->row_spacing;
       *min_item_size = MIN (*min_item_size, natural);
+      *min_item_size -= spacing;
       *min_item_size -= 2 * priv->item_padding;
     }
 
   if (max_item_size)
     {
       *max_item_size = size / *max_items;
-      if (orientation == GTK_ORIENTATION_HORIZONTAL)
-        *max_item_size -= priv->column_spacing;
-      else
-        *max_item_size -= priv->row_spacing;
       *max_item_size = MIN (*max_item_size, natural);
+      *max_item_size -= spacing;
       *max_item_size -= 2 * priv->item_padding;
     }
 }