Simple version:
export PROMPT_COMMAND='printf "%*s\r\e[K" $COLUMNS'

More complex version with an inverse exclamation mark:
export PROMPT_COMMAND='printf "\e[7m!\e[0m%*s\r\e[K" $((COLUMNS-1))'

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https://bugs.launchpad.net/bugs/1419339

Title:
  Terminal input offset incorrect after output with no trailing newline
  and  then cycling up through commands

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