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Limit throwable messages independently of stack traces - #1141
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Add an opt-in per-message character budget to preserve frames when exception messages are large. Cover causes, suppressed exceptions, small limits, omitted messages and surrogate boundaries. Fixes logfellow#1013 Signed-off-by: Alpha <2748109647@qq.com>
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Large exception messages can consume ShortenedThrowableConverter.maxLength before any frames are rendered. Add opt-in maxErrorMessageLength, applied to outer, cause and suppressed messages in either order. Defaults remain unlimited; -1 resets the limit. Existing total trace limits, the getMessage extension hook, and OMIT_THROWABLE_MESSAGE are preserved.
The per-message limit includes the ellipsis, supports small limits, and avoids splitting surrogate pairs. README explains configuration and scope: class names/prefixes are outside this budget, so no fixed frame budget is guaranteed.
Validation on Windows/JDK 21, base main 29c1452:
Fixes #1013