Avoid args-out-of-range errors on fringe clicks after "C-h k"
* src/keyboard.c (echo_truncate): Don't call Ftruncate if the echo message is already shorter than NCHARS. (Bug#27040)
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* src/keyboard.c (echo_truncate): Don't call Ftruncate if the echo message is already shorter than NCHARS. (Bug#27040)