[MacPorts] #46019: Bash completion fails when in tmux or screen

[MacPorts]

#46019: Bash completion fails when in tmux or screen
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 Reporter:  audvare@…  |      Owner:  macports-tickets@…
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.3.3
 Keywords:             |       Port:
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 Using Terminal.app, bash-completion works without using tmux. I have `.
 /opt/local/etc/profile.d/bash_completion.sh` in `~/.bashrc`. Terminal.app
 shell is set to `/opt/local/bin/bash -l` and I have Bash installed from
 MacPorts.

 When I run `screen` or `tmux`, Bash completion stops working. Tried with
 no `~/.tmux.conf` and same effect. I do not have an rc for screen.

 Steps to reproduce:
 1. `port install bash coreutils tmux bash-completion`
 2. `. /opt/local/etc/profile.d/bash_completion.sh`
 3. Be sure `ls --`<tab> works
 4. `tmux`
 5. Try `ls --`<tab>

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Ticket URL: <https://trac.macports.org/ticket/46019>
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