Fix overtyping wide characters.
Overtyping the first half of a wide character with the second half of a wide character results in display garbage. This is because the trailing dummy is not cleaned up. i.e. ATTR_WIDE, ATTR_WDUMMY, ATTR_WDUMMY Here is a short script for demonstrating the behavior: #!/bin/sh alias printf=/usr/bin/printf printf こんにちは！; sleep 2 printf '\x1b[5D'; sleep 2 printf へ; sleep 2 printf ' '; sleep 2 echomaster
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