control.ControlSender.unmute_pane

Below crate::since::CONTROL_PANE_OFF, Self::mute_pane paused the pane rather than taking it out of the stream, and this continues it: tmux resumes from the pane's current output rather than replaying what was skipped, so the caller sees a gap, not a backlog.

At or above that release, Self::mute_pane took the pane out of the stream instead, which also stopped tmux reading its pty; this turns that back on, and everything written while muted arrives at once, as a backlog rather than a gap.

This sends both tmux commands in one dispatch rather than choosing between them, so it is exactly Self::resume_pane -- either name undoes Self::mute_pane correctly regardless of which mechanism the running tmux used.

Errors

Returns an error when the connection has closed or tmux refuses the stream change.