[gegl] buffer: Explain why we do gegl_tile_store() in gegl_tile_unref()

[Martin Nordholts <martinn src gnome org>]

commit ec986dd6a6734c9a9eabd6bf67f6e082646f7fe4
Author: Martin Nordholts <martinn src gnome org>
Date:   Fri Jul 23 12:56:36 2010 +0200

    buffer: Explain why we do gegl_tile_store() in gegl_tile_unref()

 gegl/buffer/gegl-tile.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gegl/buffer/gegl-tile.c b/gegl/buffer/gegl-tile.c
index f07cf53..cb94933 100644
--- a/gegl/buffer/gegl-tile.c
+++ b/gegl/buffer/gegl-tile.c
@@ -54,6 +54,10 @@ void gegl_tile_unref (GeglTile *tile)
   if (!g_atomic_int_dec_and_test (&tile->ref_count))
     return;
 
+  /* In the case of a file store for example, we must make sure that
+   * the in-memory tile is written to disk before we free the memory,
+   * otherwise this data will be lost.
+   */
   if (!gegl_tile_is_stored (tile))
     gegl_tile_store (tile);