Session cwd defaults to same as each session's first pane

[YodaEmbedding]

Expected:

New windows start in $HOME.

Actual:

prefix+c creates a window in the same working directory as the directory that the first pane was restored to.

[YorikSar]

Came here to create an issue about this, and here it is, right at the top of the list.

It looks like this is caused by pane restore process checking if anything exists in https://github.com/tmux-plugins/tmux-resurrect/blob/master/scripts/restore.sh#L184-L202 and then calling new_session with first pane's $dir passed as -c to tmux new-session in https://github.com/tmux-plugins/tmux-resurrect/blob/master/scripts/restore.sh#L149-L151.

I usually fix it by calling ^b:attach -c <the actual default dir I want> after resurrect. We should probably be able to store this default directory for each in the state file and then restore it with tmux attach-session -c call after session creation.