[gimp] plug-ins: Change MNG capability from LAYERS_AS_ANIMATION to LAYERS

[Martin Nordholts <martinn src gnome org>]

commit ac1baa5374b92423d618dbba46dd97addf9a7fd7
Author: Martin Nordholts <martinn src gnome org>
Date:   Tue Feb 16 08:45:57 2010 +0100

    plug-ins: Change MNG capability from LAYERS_AS_ANIMATION to LAYERS
    
    When NULL is passed as format_name to gimp_export_image(), there is no
    dialog where the user can make choices. Having the capability
    GIMP_EXPORT_CAN_HANDLE_LAYERS_AS_ANIMATION in this case in practice
    means "always merge". So to allow MNG animations, change to just
    GIMP_EXPORT_CAN_HANDLE_LAYERS. We don't need to offer merging in the
    export options since MNG is a format explicitly for animation, so if
    there are enough layers, we'll always export as an animation.
    
    Also set a tooltip explaining why the animation options are disabled
    when they are disabled.

 plug-ins/common/file-mng.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/plug-ins/common/file-mng.c b/plug-ins/common/file-mng.c
index 4ce53e0..8c4a76d 100644
--- a/plug-ins/common/file-mng.c
+++ b/plug-ins/common/file-mng.c
@@ -1499,7 +1499,16 @@ mng_save_dialog (gint32 image_id)
   gtk_widget_show (vbox);
   gtk_widget_show (frame);
 
-  gtk_widget_set_sensitive (frame, num_layers > 1);
+  if (num_layers <= 1)
+    {
+      gtk_widget_set_sensitive (frame, FALSE);
+      gimp_help_set_help_data (frame,
+                               _("These options are only available when "
+                                 "the exported image has more than one "
+                                 "layer. The image you are exporting only has "
+                                 "one layer."),
+                               NULL);
+    }
 
   gtk_widget_show (main_vbox);
   gtk_widget_show (dialog);
@@ -1592,7 +1601,7 @@ run (const gchar      *name,
                                        GIMP_EXPORT_CAN_HANDLE_GRAY |
                                        GIMP_EXPORT_CAN_HANDLE_INDEXED |
                                        GIMP_EXPORT_CAN_HANDLE_ALPHA |
-                                       GIMP_EXPORT_CAN_HANDLE_LAYERS_AS_ANIMATION));
+                                       GIMP_EXPORT_CAN_HANDLE_LAYERS));
         }
 
       if (export == GIMP_EXPORT_CANCEL)