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In FieldCustomizer, I requested focus for a control using requestFocus() inside overriden JPanel's addNotify(). To my surprise, when the dialog became visible, there were two carets blinking - one in a JTextArea occupied by Nb EditorKit. This does not happen, if using standard Swing editor kit for text/plain.
*** Issue 6599 has been marked as a duplicate of this issue. ***
Fixed in BaseCaret
Resolved for 3.3.x or earlier, no new info since then -> closing.