nixos/tmux: use idempotent new-session to avoid duplicate sessions #468337
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When both NixOS programs.tmux and home-manager tmux configs set newSession = true, tmux would create two sessions on startup since both /etc/tmux.conf and ~/.config/tmux/tmux.conf contain the new-session command. Change new-session to new-session -A -s 0, which attaches to session "0" if it exists, otherwise creates it. This makes the command idempotent so multiple configs can safely enable newSession.
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When both NixOS programs.tmux and home-manager tmux configs set
newSession = true, tmux would create two sessions on startup since
both /etc/tmux.conf and ~/.config/tmux/tmux.conf contain the
new-session command.
Change new-session to new-session -A -s 0, which attaches to session
"0" if it exists, otherwise creates it. This makes the command
idempotent so multiple configs can safely enable newSession.
c.f. nix-community/home-manager#8307
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