[gimp] app: never propagate indexed images to floating point

[Michael Natterer <mitch src gnome org>]

commit db98dc5eaa2c15de0b407d25ea66952861019e29
Author: Michael Natterer <mitch gimp org>
Date:   Thu Jan 26 17:16:16 2017 +0100

    app: never propagate indexed images to floating point

 app/file/file-open.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/app/file/file-open.c b/app/file/file-open.c
index d683d72..8aa9ec5 100644
--- a/app/file/file-open.c
+++ b/app/file/file-open.c
@@ -279,8 +279,9 @@ file_open_image (Gimp                *gimp,
     {
       gimp_image_undo_disable (image);
 
-      if (run_mode == GIMP_RUN_INTERACTIVE   &&
-          gimp->config->import_promote_float &&
+      if (run_mode == GIMP_RUN_INTERACTIVE                 &&
+          gimp_image_get_base_type (image) != GIMP_INDEXED &&
+          gimp->config->import_promote_float               &&
           file_open_file_proc_is_import (file_proc))
         {
           GimpPrecision old_precision = gimp_image_get_precision (image);