Suggesting ZSH_TMUX_AUTOCONNECT behavior change

[btolsch]

Is your feature request related to a particular plugin or theme? If so, specify it.
Yes, the tmux plugin.

Is your feature request related to a problem? Please describe.
I like to leave tmux sessions that I may use later open (e.g. closing a terminal window with actually exiting the shell, disconnecting from an ssh-hosted tmux session). Then, simply opening a new window re-attaches to the unattached session. If there are no unattached sessions, I probably want a new session. ZSH_TMUX_AUTOCONNECT doesn't serve this purpose because it always autoconnects, so every new window will connect to the exact same session.

Describe the solution you'd like
I prefer the behavior described above, and I don't see a simple way to implement this outside the plugin (e.g. only specifying args to the alias). I think it's reasonable for ZSH_TMUX_AUTOCONNECT to use this behavior instead of its current behavior. Its current behavior seems limited since it also just auto-attaches to the first open session. If you meant to attach multiple times to a specific session, the default s bind is more flexible.

Describe alternatives you've considered
I currently use my fork that implements this, but I also considered with the tmux alias' argument override was a possible solution. I didn't find a way to implement this in that way though, at least not without duplicating the plugin's startup logic.

Additional context
A commit implementing this is here: btolsch@c64f701