don't empty PROMPT in preexec; it makes it harder to debug stuff

internal/p10k.zsh

@@ -5306,7 +5306,7 @@ _p9k_must_init() {
     [[ $sig == $_p9k__param_sig ]] && return 1
     _p9k_deinit
   fi
-  _p9k__param_pat=$'v6\1'${ZSH_VERSION}$'\1'${ZSH_PATCHLEVEL}$'\1'
+  _p9k__param_pat=$'v7\1'${ZSH_VERSION}$'\1'${ZSH_PATCHLEVEL}$'\1'
   _p9k__param_pat+=$'${#parameters[(I)POWERLEVEL9K_*]}\1${(%):-%n%#}\1$GITSTATUS_LOG_LEVEL\1'
   _p9k__param_pat+=$'$GITSTATUS_ENABLE_LOGGING\1$GITSTATUS_DAEMON\1$GITSTATUS_NUM_THREADS\1'
   _p9k__param_pat+=$'$DEFAULT_USER\1${ZLE_RPROMPT_INDENT:-1}\1$P9K_SSH\1$__p9k_ksh_arrays'
@@ -5580,7 +5580,7 @@ _p9k_init() {
   if (( $+functions[iterm2_decorate_prompt] )); then
     _p9k__iterm2_decorate_prompt=$functions[iterm2_decorate_prompt]
     function iterm2_decorate_prompt() {
-      typeset -g ITERM2_PRECMD_PS1=
+      typeset -g ITERM2_PRECMD_PS1=$PROMPT
       typeset -g ITERM2_SHOULD_DECORATE_PROMPT=
     }
   fi