[gimp] app: don't disable filter format conversion if != drawable format

[Ell <ell src gnome org>]

commit 30da2f3d6fbf426b6a7b90074552efdd6515c23b
Author: Ell <ell_se yahoo com>
Date:   Mon Mar 25 09:14:06 2019 -0400

    app: don't disable filter format conversion if != drawable format
    
    In gimp_drawable_merge_filter(), don't disable the filter
    applicator's output-format conversion node if the output format is
    different than the drawable's format, since it may change the
    result.

 app/core/gimpdrawable-filters.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/app/core/gimpdrawable-filters.c b/app/core/gimpdrawable-filters.c
index bd37645959..c771c26ca7 100644
--- a/app/core/gimpdrawable-filters.c
+++ b/app/core/gimpdrawable-filters.c
@@ -160,7 +160,8 @@ gimp_drawable_merge_filter (GimpDrawable *drawable,
       applicator_output_format = gimp_applicator_get_output_format (applicator);
 
       gimp_applicator_set_cache (applicator, FALSE);
-      gimp_applicator_set_output_format (applicator, NULL);
+      if (applicator_output_format == gimp_drawable_get_format (drawable))
+        gimp_applicator_set_output_format (applicator, NULL);
     }
 
   gimp_gegl_rectangle_align_to_tile_grid (