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When using code completion (Ctrl+Space) during instant rename (Ctrl+R), exiting code completion (closing the popup) via Esc or Enter also exits instant rename mode. Found with build 200707171200.
Sorry, but I do not think that use of CC inside the instant rename is a principal usecase.
Probably won't be done in foreseeable future.
NetBeans.org Migration: changing resolution from LATER to WONTFIX