• creating an empty tree would fail in 3.0.6
• fixed problems with duplicated IDs as a result from screen reader optimizations (copy_node / create_node failed)
• changing node type from a type with no icon to a type with one would fail (types plugin)
• added quicksearch (same as in most file explorers, also following WAI-ARIA specs)
• optimized get_node selector handling (for IDs prefixed with #)