[gimp] app: in gimp:fill-source, align result to tile grid

[Ell <ell src gnome org>]

commit fa31854a66f5317867a8dbe2137969444ad59c93
Author: Ell <ell_se yahoo com>
Date:   Sat Mar 30 12:01:06 2019 -0400

    app: in gimp:fill-source, align result to tile grid
    
    In gimp:fill-source, align the result rect to the drawable buffer's
    tile grid, so that all tiles are COWed for solid-color fills.

 app/operations/gimpoperationfillsource.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/app/operations/gimpoperationfillsource.c b/app/operations/gimpoperationfillsource.c
index 1e285202ab..c2a798fd06 100644
--- a/app/operations/gimpoperationfillsource.c
+++ b/app/operations/gimpoperationfillsource.c
@@ -26,6 +26,8 @@
 
 #include "operations-types.h"
 
+#include "gegl/gimp-gegl-utils.h"
+
 #include "core/gimpdrawable.h"
 #include "core/gimpfilloptions.h"
 
@@ -233,11 +235,16 @@ gimp_operation_fill_source_process (GeglOperation        *operation,
 
   if (fill_source->options && fill_source->drawable)
     {
-      GeglBuffer *buffer;
+      GeglBuffer    *buffer;
+      GeglRectangle  rect;
+
+      gimp_gegl_rectangle_align_to_tile_grid (
+        &rect, result,
+        gimp_drawable_get_buffer (fill_source->drawable));
 
       buffer = gimp_fill_options_create_buffer (fill_source->options,
                                                 fill_source->drawable,
-                                                result,
+                                                &rect,
                                                 fill_source->pattern_offset_x,
                                                 fill_source->pattern_offset_y);