[gtk+/gtk-3-16] treeview: always pixelcache widget contents

commit 22d0c317c2526a49b7d8fbc408f9c11070204a70
Author: Christian Hergert <christian hergert me>
Date:   Tue Jun 16 16:50:44 2015 -0700

    treeview: always pixelcache widget contents
    GtkTreeView has a particularly expensive drawing path. This can cause
    issues when part of animated widget sequences. Caching the content while
    a model is attached helps reduce the number of full redraws during
    exposure greatly.

 gtk/gtktreeview.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index 87d446b..c7341fd 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -11536,6 +11536,8 @@ gtk_tree_view_set_model (GtkTreeView  *tree_view,
   if (tree_view->priv->selection)
   _gtk_tree_selection_emit_changed (tree_view->priv->selection);
+  _gtk_pixel_cache_set_always_cache (tree_view->priv->pixel_cache, (model != NULL));
   if (gtk_widget_get_realized (GTK_WIDGET (tree_view)))
     gtk_widget_queue_resize (GTK_WIDGET (tree_view));

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