lib/termsupport.zsh
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 case "$TERM" in
   xterm*|rxvt*)
     preexec () {
       print -Pn "\e]0;%n@%m: $1\a"  # xterm
     }
     precmd () {
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       oh_my_zsh_theme_precmd
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       print -Pn "\e]0;%n@%m: %~\a"  # xterm
     }
     ;;
   screen*)
     preexec () {
       local CMD=${1[(wr)^(*=*|sudo|ssh|-*)]}
       echo -ne "\ek$CMD\e\\"
       print -Pn "\e]0;%n@%m: $1\a"  # xterm
     }
     precmd () {
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       oh_my_zsh_theme_precmd
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       echo -ne "\ekzsh\e\\"
       print -Pn "\e]0;%n@%m: %~\a"  # xterm
     }
     ;;
 esac