How to deal with PROMPT_COMMAND formatting getting yanked up? #887

I'm on MacOS. My zsh terminal always looked like this:

Yep, my home directory is a git repo, don't be confused about [master] please. :)

I achieved this by using this .zshrc code:

# Styles
autoload -Uz vcs_info
precmd() { vcs_info && echo -ne "\e]1;${PWD##*/}\a" }
zstyle ':vcs_info:git:*' formats '[%b]'
setopt PROMPT_SUBST
PS1="%{%F{#edc57d}%}%~%{%f%} \$(e=\$?;[ \$e -ne 0 ] && echo %{%F{#f06372}%}%B\$e\ 󱋪 %b%{%f%} || echo %{%F{#8cc470}%}%B󱋪\ %b%{%f%})"
RPROMPT="%{%F{#d373e3}%}\$vcs_info_msg_0_ "

I used tmuxinator quite a while with zsh and I often initiated panes just with - clear or - echo '' to have empty ones spawned. The prompt above always looked right in those panels.

Now I switched my default shell to /bin/bash. To achieve the same prompt, I use this .bashrc code:

# Styles
function prompt() {
	local columns
	columns=$(tput cols)
	local compensate=27
	local prompt
	local rprompt
	rprompt="\[\033[38;5;171m\][$(git rev-parse --abbrev-ref HEAD 2>/dev/null || true)]\[\033[0m\]"
	#shellcheck disable=SC2140
	prompt="\[\033[38;5;221m\]\\$(pwd | sed "s,^$HOME,~,")\[\033[1m\] \$(e=\$?;[ \$e -ne 0 ] && echo '\[\033[38;5;203m\]'"\$e"' > \[\033[0m\]' || echo '\[\033[38;5;113m\]> \[\033[0m\]')"
    PS1=$(printf "%*s\r%s" "$((columns + compensate))" "$rprompt" "$prompt")
}
PROMPT_COMMAND=prompt

It looks the same, but resizing any terminal doesn't play well with it, and this causes problems with tmuxinator as well. Panes do initiate, but the prompt gets messed up:

I think this has to be the result by the fact, that tmuxinator runs the initial code before adding the next pane, thus it will resize whatever is in the pane after the command has run. The prompt gets fixed if I hit enter in the pane once, because it will re-evaluate my prompt function.

The problem in action:

No combination of shopt -s checkwinsize and trap 'prompt' WINCH solve this issue. I think it would be nice if tmuxinator could first create all the panes and then run the initial commands, so that a simple - clear will make those prompts nice to look at.