[gimp] app: fix #7682 crash loading xcf with linked text layers

[Jacob Boerema <jboerema src gnome org>]

commit 1858d72d032a0bd4ccb26b62f3e8c8310b9f61f6
Author: Jacob Boerema <jgboerema gmail com>
Date:   Thu Jan 6 15:03:51 2022 -0500

    app: fix #7682 crash loading xcf with linked text layers
    
    Due to recent changes on master the linked layers concept doesn't exist
    anymore. The conversion code checks whether all linked layers are valid.
    However, text layers need special handling.
    
    In the past updating the linked_layers wasn't needed when the layer pointer
    of a text layer was changed. Now, that has changed because we parse that
    list for valid layers. To fix this we update linked_layers in the same
    way as already was done for selected_layers.

 app/xcf/xcf-load.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/app/xcf/xcf-load.c b/app/xcf/xcf-load.c
index 53d625d594..2a30ba9222 100644
--- a/app/xcf/xcf-load.c
+++ b/app/xcf/xcf-load.c
@@ -2082,6 +2082,7 @@ xcf_load_layer (XcfInfo    *info,
   gboolean           edit_mask  = FALSE;
   gboolean           show_mask  = FALSE;
   GList             *selected;
+  GList             *linked;
   gboolean           floating;
   guint32            group_layer_flags = 0;
   guint32            text_layer_flags = 0;
@@ -2205,6 +2206,7 @@ xcf_load_layer (XcfInfo    *info,
 
   /* call the evil text layer hack that might change our layer pointer */
   selected = g_list_find (info->selected_layers, layer);
+  linked   = g_list_find (info->linked_layers, layer);
   floating = (info->floating_sel == layer);
 
   if (gimp_text_layer_xcf_load_hack (&layer))
@@ -2217,6 +2219,11 @@ xcf_load_layer (XcfInfo    *info,
           info->selected_layers = g_list_delete_link (info->selected_layers, selected);
           info->selected_layers = g_list_prepend (info->selected_layers, layer);
         }
+      if (linked)
+        {
+          info->linked_layers = g_list_delete_link (info->linked_layers, linked);
+          info->linked_layers = g_list_prepend (info->linked_layers, layer);
+        }
       if (floating)
         info->floating_sel = layer;
     }