Simplify Pygmalion Theme

The Pygmalion theme previously had some logic for counting line length and taking action based on line length. The action was removed in c52441b624, but the counting still needlessly happens. 

This commit removes the code to count line length, and simplifies the Pygmalion theme by moving the "precmd" into the setup. 

As a bonus unintended side effect, this makes the Pygmalion theme compatible with the current async prompting logic (i.e. after this change, Pygmalion is no longer affected by https://github.com/ohmyzsh/ohmyzsh/issues/12328)

themes/pygmalion.zsh-theme

@@ -1,7 +1,7 @@
 # Yay! High voltage and arrows!
 
 prompt_setup_pygmalion(){
-  setopt localoptions extendedglob
+  setopt localoptions nopromptsubst extendedglob
 
   ZSH_THEME_GIT_PROMPT_PREFIX="%{$reset_color%}%{$fg[green]%}"
   ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%} "
@@ -10,22 +10,6 @@ prompt_setup_pygmalion(){
 
   base_prompt='%{$fg[magenta]%}%n%{$reset_color%}%{$fg[cyan]%}@%{$reset_color%}%{$fg[yellow]%}%m%{$reset_color%}%{$fg[red]%}:%{$reset_color%}%{$fg[cyan]%}%0~%{$reset_color%}%{$fg[red]%}|%{$reset_color%}'
   post_prompt='%{$fg[cyan]%}⇒%{$reset_color%}  '
-
-  base_prompt_nocolor=${base_prompt//\%\{[^\}]##\}}
-  post_prompt_nocolor=${post_prompt//\%\{[^\}]##\}}
-
-  autoload -U add-zsh-hook
-  add-zsh-hook precmd prompt_pygmalion_precmd
-}
-
-prompt_pygmalion_precmd(){
-  setopt localoptions nopromptsubst extendedglob
-
-  local gitinfo=$(git_prompt_info)
-  local gitinfo_nocolor=${gitinfo//\%\{[^\}]##\}}
-  local exp_nocolor="$(print -P \"${base_prompt_nocolor}${gitinfo_nocolor}${post_prompt_nocolor}\")"
-  local prompt_length=${#exp_nocolor}
-
   PROMPT="${base_prompt}\$(git_prompt_info)${post_prompt}"
 }