[gimp/gimp-2-10] app: don't use direct-buffer fill when some components are masked

[Ell <ell src gnome org>]

commit fa74fe78f9757a82e03773210e9630e289a560af
Author: Ell <ell_se yahoo com>
Date:   Mon Dec 3 09:52:49 2018 -0500

    app: don't use direct-buffer fill when some components are masked
    
    (cherry picked from commit 83250eb57c46b5ca2b7bbc3353bbc7a14b806a80)

 app/core/gimpdrawable-edit.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/app/core/gimpdrawable-edit.c b/app/core/gimpdrawable-edit.c
index d63b4a50f7..cd9a4071b8 100644
--- a/app/core/gimpdrawable-edit.c
+++ b/app/core/gimpdrawable-edit.c
@@ -58,6 +58,7 @@ gimp_drawable_edit_can_fill_direct (GimpDrawable    *drawable,
   GimpImage                *image;
   GimpContext              *context;
   gdouble                   opacity;
+  GimpComponentMask         affect;
   GimpLayerMode             mode;
   GimpLayerCompositeMode    composite_mode;
   GimpLayerCompositeRegion  composite_region;
@@ -65,12 +66,14 @@ gimp_drawable_edit_can_fill_direct (GimpDrawable    *drawable,
   image            = gimp_item_get_image (GIMP_ITEM (drawable));
   context          = GIMP_CONTEXT (options);
   opacity          = gimp_context_get_opacity (context);
+  affect           = gimp_drawable_get_active_mask (drawable);
   mode             = gimp_context_get_paint_mode (context);
   composite_mode   = gimp_layer_mode_get_paint_composite_mode (mode);
   composite_region = gimp_layer_mode_get_included_region (mode, composite_mode);
 
   if (gimp_channel_is_empty (gimp_image_get_mask (image)) &&
       opacity == GIMP_OPACITY_OPAQUE                      &&
+      affect  == GIMP_COMPONENT_MASK_ALL                  &&
       gimp_layer_mode_is_trivial (mode)                   &&
       (! gimp_layer_mode_is_subtractive (mode)            ^
        ! (composite_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE)))