[gnome-builder] editor: add note about workaround

[Christian Hergert <chergert src gnome org>]

commit e178c15815e4909a425da91b3200e432b2a136dd
Author: Christian Hergert <christian hergert me>
Date:   Mon Nov 17 21:21:27 2014 -0800

    editor: add note about workaround

 src/editor/gb-source-view.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/editor/gb-source-view.c b/src/editor/gb-source-view.c
index ee1d651..c8db020 100644
--- a/src/editor/gb-source-view.c
+++ b/src/editor/gb-source-view.c
@@ -1353,6 +1353,13 @@ gb_source_view_real_draw_layer (GbSourceView     *view,
   GtkTextView *text_view = GTK_TEXT_VIEW (view);
   GtkTextBuffer *buffer;
 
+  /*
+   * WORKAROUND:
+   *
+   * We can't do our grid background from a GtkSourceStyleScheme, so we hack it
+   * in here. Once we can do this with CSS background's, we should probably do
+   * it there.
+   */
   GTK_TEXT_VIEW_CLASS (gb_source_view_parent_class)->draw_layer (text_view, layer, cr);
 
   if ((layer == GTK_TEXT_VIEW_LAYER_BELOW) &&