Fabian Boehm e45bddcbb1 __fish_cursor_xterm: Ignore unknown cursor settings ...

This prevents leaking the escape sequence by printing nonsense, and it
also allows disabling cursor setting by just setting the variable to
e.g. empty.

And if we ever added any shapes, it would allow them to be used on new
fish and ignored on old

Fixes #9698

2023-03-31 20:07:54 +02:00

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