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test(display): cover malformed UTF-8 and fix boundary read - #596
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Summary
Crash fixed
The new truncated-input test reproduced an AddressSanitizer heap-buffer-overflow in display_model_wrap_line: a two-byte buffer containing a four-byte UTF-8 lead and NUL was read past its terminator. The display tests now pass under ASan/UBSan.
Verification