Quote expansion of $PWD to prevent word-splitting of its value, which
gives an incorrect result if there is a single space and an error
message if there is more than one space:
❯ basename /tmp/foo
foo
❯ basename /tmp/foo bar
foo
❯ basename /tmp/foo bar baz
basename: extra operand ‘baz’
Try 'basename --help' for more information.
Changes the behaviour of a bg:none color string so that
it causes the background to have no color instead of
decoloring the entire string like it did before.
