tmux: mouse support

[cor]

Description

Allows you to enable mouse support in tmux

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

[berbiche]

Thanks for the contribution!

[berbiche]

Hi,
Can you update the tmux tests to reflect your change?
Thanks

[stale]

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