When expanding a line in order to clear it, we need to use the default background colour - there may be portions that we do not want to clear with the new background colour.
When expanding a line in order to clear it, we need to use the default
background colour - there may be portions that we do not want to clear
with the new background colour.

klaxalk/tmux,klaxalk/tmux,klaxalk/tmux,klaxalk/tmux,klaxalk/tmux