[gimp] Fix loading of layer trees when there is a floating selection

[Michael Natterer <mitch src gnome org>]

commit cdbb8e169706c5cf08ea6454d69bb510f583a5d9
Author: Michael Natterer <mitch gimp org>
Date:   Mon Aug 31 15:15:30 2009 +0200

    Fix loading of layer trees when there is a floating selection
    
    A floating selection is always the first layer in the image, but on
    XCF loading it is attached *after* all layers are loaded, so the item
    paths for child layers read from the XCF are off-by-one in their
    toplevel index. Adjust them so everything loads as it should.

 app/xcf/xcf-load.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/app/xcf/xcf-load.c b/app/xcf/xcf-load.c
index 21ccf8f..86b6887 100644
--- a/app/xcf/xcf-load.c
+++ b/app/xcf/xcf-load.c
@@ -210,6 +210,22 @@ xcf_load_image (Gimp     *gimp,
 
           if (item_path)
             {
+              if (info->floating_sel)
+                {
+                  /* there is a floating selection, but it will get
+                   * added after all layers are loaded, so toplevel
+                   * layer indices are off-by-one. Adjust item paths
+                   * accordingly:
+                   */
+                  gint toplevel_index;
+
+                  toplevel_index = GPOINTER_TO_UINT (item_path->data);
+
+                  toplevel_index--;
+
+                  item_path->data = GUINT_TO_POINTER (toplevel_index);
+                }
+
               parent = GIMP_LAYER
                 (gimp_item_stack_get_parent_by_path (GIMP_ITEM_STACK (layers),
                                                      item_path,