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The C-level function consolecmd had been broken in non-Latin-1 single-byte locales in R 2.8.0 by changes intended to support the Japanese IME. This affected some menu items in Rgui (e.g. to source R files with non-Latin-1 names) and submitting commands from the script editor, but only in rarer languages such as Central European, Greek and Cyrillic. (PR#13195, probably also PR#13120)