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How to reproduce: 1) Invoke any taglib editor dialog: 1a) Create TagLibrary 1b) Open Tag Library Customizer by double-clicking on created node 2) ERROR - See dialog - it does not have initial focus 3) ERROR - Press Escape key - it does nothing
It is the same for tag customizer.
Both taglib and tag functionality was changed. (replaced by tag handler wizard feature) The TLD and tag customizers were removed from 4.0.