[gimp] Kill plug-ins that write to tiles of locked drawables or group layers

[Michael Natterer <mitch src gnome org>]

commit 1735f86d258f7fcd8726becd75ab3d4ec6cfa547
Author: Michael Natterer <mitch gimp org>
Date:   Wed Sep 2 19:48:46 2009 +0200

    Kill plug-ins that write to tiles of locked drawables or group layers
    
    Yes this is pretty lame, but we must prevent write access to these
    items under all circumstances, and we have no other way but killing
    the plug-in (it should not write to the drawable directly anyway)

 app/plug-in/gimpplugin-message.c |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)
---
diff --git a/app/plug-in/gimpplugin-message.c b/app/plug-in/gimpplugin-message.c
index 643fc02..376b8d9 100644
--- a/app/plug-in/gimpplugin-message.c
+++ b/app/plug-in/gimpplugin-message.c
@@ -257,12 +257,40 @@ gimp_plug_in_handle_tile_put (GimpPlugIn *plug_in,
 
   if (tile_info->shadow)
     {
+      /*  don't check whether the drawable is a group or locked here,
+       *  the plugin will get a proper error message when it tries to
+       *  merge the shadow tiles, which is much better than just
+       *  killing it.
+       */
       tm = gimp_drawable_get_shadow_tiles (drawable);
 
       gimp_plug_in_cleanup_add_shadow (plug_in, drawable);
     }
   else
     {
+      if (gimp_item_is_content_locked (GIMP_ITEM (drawable)))
+        {
+          gimp_message (plug_in->manager->gimp, NULL, GIMP_MESSAGE_ERROR,
+                        "Plug-In \"%s\"\n(%s)\n\n"
+                        "tried writing to a locked drawable %d (killing)",
+                        gimp_object_get_name (plug_in),
+                        gimp_filename_to_utf8 (plug_in->prog),
+                        tile_info->drawable_ID);
+          gimp_plug_in_close (plug_in, TRUE);
+          return;
+        }
+      else if (gimp_viewable_get_children (GIMP_VIEWABLE (drawable)))
+        {
+          gimp_message (plug_in->manager->gimp, NULL, GIMP_MESSAGE_ERROR,
+                        "Plug-In \"%s\"\n(%s)\n\n"
+                        "tried writing to a group layer %d (killing)",
+                        gimp_object_get_name (plug_in),
+                        gimp_filename_to_utf8 (plug_in->prog),
+                        tile_info->drawable_ID);
+          gimp_plug_in_close (plug_in, TRUE);
+          return;
+        }
+
       tm = gimp_drawable_get_tiles (drawable);
     }