listview: Reset listitems' CSS animations when rebinding

This way, newly displayed rows don't play an unselect animation (text
fading in) when they are unselected, but the row was previously used for
a selected item.

gtk/gtklistitem.c

@@ -22,8 +22,10 @@
 #include "gtklistitemprivate.h"
 
 #include "gtkbinlayout.h"
+#include "gtkcssnodeprivate.h"
 #include "gtkintl.h"
 #include "gtkwidget.h"
+#include "gtkwidgetprivate.h"
 
 /**
  * SECTION:gtklistitem
@@ -325,6 +327,8 @@ gtk_list_item_set_item (GtkListItem *self,
   if (item)
     self->item = g_object_ref (item);
 
+  gtk_css_node_invalidate (gtk_widget_get_css_node (GTK_WIDGET (self)), GTK_CSS_CHANGE_ANIMATIONS);
+
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ITEM]);
 }