[layers] Fix a bug with scroll. Implemented basic save/load of layers in GIF as non-looping animation.

git-svn-id: svn://pulkomandy.tk/GrafX2/branches/layers@1058 416bcca6-2ee7-4201-b75f-2eb2f807beb1

operatio.c

@@ -4032,6 +4032,10 @@ void Scroll_0_5(void)
     // Do the actual scroll operation on all layers.
     for (i=0; i<Main_backups->Pages->Nb_layers; i++)
       Scroll_picture(Main_backups->Pages->Next->Image[i], Main_backups->Pages->Image[i], x_offset, y_offset);
+    // Update the depth buffer too ...
+    // It would be faster to scroll it, but we don't have method
+    // for in-place scrolling.
+    Update_depth_buffer();
   }  
   else
   {