[gtk+] treeview: Don't invalidate whole tree unless needed

[Alexander Larsson <alexl src gnome org>]

commit 4ca293e006a00ce8529e17d9202faaf68f57ff6f
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Dec 6 22:28:11 2012 +0100

    treeview: Don't invalidate whole tree unless needed
    
    We currently invalidate the whole tree every time the style state
    changes in the tree view. The primary reason for this is to catch
    default font changes as that may affect text cell renderers. But
    cell renderers could *potentially* also read other style properties
    (although that seems weird and unlikely).
    
    We handle this by invalidating only when some state that affects sizes
    is changed. This includes all the font properties.

 gtk/gtktreeview.c |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)
---
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index d651bd6..c422172 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -8461,6 +8461,8 @@ gtk_tree_view_style_updated (GtkWidget *widget)
   GtkTreeView *tree_view = GTK_TREE_VIEW (widget);
   GList *list;
   GtkTreeViewColumn *column;
+  GtkStyleContext *style_context;
+  const GtkBitmask *changes;
 
   GTK_WIDGET_CLASS (gtk_tree_view_parent_class)->style_updated (widget);
 
@@ -8472,16 +8474,19 @@ gtk_tree_view_style_updated (GtkWidget *widget)
       gtk_tree_view_set_enable_tree_lines (tree_view, tree_view->priv->tree_lines_enabled);
     }
 
-  for (list = tree_view->priv->columns; list; list = list->next)
+  style_context = gtk_widget_get_style_context (widget);
+  changes = _gtk_style_context_get_changes (style_context);
+  if (changes == NULL || _gtk_css_style_property_changes_affect_size (changes))
     {
-      column = list->data;
-      _gtk_tree_view_column_cell_set_dirty (column, TRUE);
-    }
-
-  tree_view->priv->fixed_height = -1;
-  _gtk_rbtree_mark_invalid (tree_view->priv->tree);
+      for (list = tree_view->priv->columns; list; list = list->next)
+	{
+	  column = list->data;
+	  _gtk_tree_view_column_cell_set_dirty (column, TRUE);
+	}
 
-  gtk_widget_queue_resize (widget);
+      tree_view->priv->fixed_height = -1;
+      _gtk_rbtree_mark_invalid (tree_view->priv->tree);
+    }
 }