[gimp] app: add XCF version 13 for images with group-layer masks

[N/A <ell src gnome org>]

commit 17fb6447872be8feb020858c6cb565b5634f0a0b
Author: Ell <ell_se yahoo com>
Date:   Mon Feb 5 13:54:21 2018 -0500

    app: add XCF version 13 for images with group-layer masks

 app/core/gimpimage.c |    9 ++++++++-
 app/xcf/xcf.c        |    3 ++-
 2 files changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/app/core/gimpimage.c b/app/core/gimpimage.c
index d8457c7..c0e413c 100644
--- a/app/core/gimpimage.c
+++ b/app/core/gimpimage.c
@@ -2445,7 +2445,13 @@ gimp_image_get_xcf_version (GimpImage    *image,
 
       /* need version 3 for layer trees */
       if (gimp_viewable_get_children (GIMP_VIEWABLE (layer)))
-        version = MAX (3, version);
+        {
+          version = MAX (3, version);
+
+          /* need version 13 for group layers with masks */
+          if (gimp_layer_get_mask (layer))
+            version = MAX (13, version);
+        }
     }
 
   g_list_free (layers);
@@ -2502,6 +2508,7 @@ gimp_image_get_xcf_version (GimpImage    *image,
     case 10:
     case 11:
     case 12:
+    case 13:
       if (gimp_version)   *gimp_version   = 210;
       if (version_string) *version_string = "GIMP 2.10";
       break;
diff --git a/app/xcf/xcf.c b/app/xcf/xcf.c
index 7cc6944..16cee0b 100644
--- a/app/xcf/xcf.c
+++ b/app/xcf/xcf.c
@@ -79,7 +79,8 @@ static GimpXcfLoaderFunc * const xcf_loaders[] =
   xcf_load_image,   /* version  9 */
   xcf_load_image,   /* version 10 */
   xcf_load_image,   /* version 11 */
-  xcf_load_image    /* version 12 */
+  xcf_load_image,   /* version 12 */
+  xcf_load_image    /* version 13 */
 };