termsupport: protect title() with emulate -L zsh
This prevents it from malfunctioning when `setopt prompt_subst` is off.
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@ -7,6 +7,9 @@
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# (In screen, only short_tab_title is used)
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# Limited support for Apple Terminal (Terminal can't set window and tab separately)
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function title {
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emulate -L zsh
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setopt prompt_subst
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[[ "$EMACS" == *term* ]] && return
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# if $2 is unset use $1 as default
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