textlayout: Don't call render_para too much

render_para produces no nodes for an empty paragraph.
Don't call it over and over for those.

diff --git a/gtk/gtktextlayout.c b/gtk/gtktextlayout.c
index ae6ed3bb311284002113861a9d099d55f92f75e9..4ab2b5cd4dea400583d1cd9045d5af266f95737b 100644 (file)
--- a/gtk/gtktextlayout.c
+++ b/gtk/gtktextlayout.c
@@ -4245,7 +4245,9 @@ gtk_text_layout_snapshot (GtkTextLayout      *layout,
                 g_clear_pointer (&line_display->node, gsk_render_node_unref);
             }
 
-          if (line_display->node == NULL)
+          if (line_display->node == NULL &&
+              (pango_layout_get_character_count (line_display->layout) > 0 ||
+               selection_start_index != -1 || selection_end_index != -1))
             {
               gtk_snapshot_push_collect (snapshot);
               render_para (crenderer, line_display,