[gegl] buffer: keep tile data-pointer indetity in gegl_buffer_linear_new_from_data()

[Ell <ell src gnome org>]

commit db4a061e6ef8c6b2e895ef235a94c01cc61d8815
Author: Ell <ell_se yahoo com>
Date:   Wed Jan 2 07:25:39 2019 -0500

    buffer: keep tile data-pointer indetity in gegl_buffer_linear_new_from_data()
    
    In gegl_buffer_linear_new_from_data(), set the buffer's linear
    tile's keep_identity flag, to guarantee that its data-pointer
    identity is kept throughout the lifetime of the buffer.

 gegl/buffer/gegl-buffer-linear.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gegl/buffer/gegl-buffer-linear.c b/gegl/buffer/gegl-buffer-linear.c
index 18bf1ce09..ef74fce59 100644
--- a/gegl/buffer/gegl-buffer-linear.c
+++ b/gegl/buffer/gegl-buffer-linear.c
@@ -106,6 +106,7 @@ gegl_buffer_linear_new_from_data (const gpointer       data,
   tile->y = 0;
   tile->z = 0;
   tile->rev = tile->stored_rev + 1;
+  tile->keep_identity = TRUE;
   gegl_tile_set_data_full (tile,
                            (gpointer) data,
                            bpp * rowstride * extent->height,