[gimp/gimp-2-8] Bug 711329 - Artifacts on crop tool's passepartout when set to "allow growing"

[Michael Natterer <mitch src gnome org>]

commit be45e402183886dc1a8d345486de5301b8b8d32d
Author: Michael Natterer <mitch gimp org>
Date:   Sun Nov 3 15:21:22 2013 +0100

    Bug 711329 - Artifacts on crop tool's passepartout when set to "allow growing"
    
    Calculate GimpCanvasPassepartout's extents using a cairo_region_xor()
    of the crop rectangle and the image extents, instead of a
    cairo_region_subtract(). This fixes the artifacts and has the nice
    side effect that the passepartout now colors both the parts of the
    image that will be removed *and* the parts of the image that will be
    newly added.
    
    (cherry picked from commit 61c2ef40f711f0e452bd8baa67813c454e5a7658)

 app/display/gimpcanvaspassepartout.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/display/gimpcanvaspassepartout.c b/app/display/gimpcanvaspassepartout.c
index 7bb653d..3d4dc1c 100644
--- a/app/display/gimpcanvaspassepartout.c
+++ b/app/display/gimpcanvaspassepartout.c
@@ -97,7 +97,7 @@ gimp_canvas_passe_partout_get_extents (GimpCanvasItem   *item,
 
   inner = GIMP_CANVAS_ITEM_CLASS (parent_class)->get_extents (item, shell);
 
-  cairo_region_subtract (outer, inner);
+  cairo_region_xor (outer, inner);
 
   return outer;
 }