xcompose
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Need a mapping for minus sign
A mapping for
U+2212 MINUS SIGN
is probably too basic to leave out.
This was added to the defaults for the en_US.UTF-8 locale in November 2022 with commit mirror/libX11@6baccbae5324e7342cb5176cae82f463a6b34eae. So this is probably no longer needed.
The sequence is Compose, - (hyphen-minus), _ (underscore).
(Unfortunately it doesn’t work for me, possibly because my locale is en_AU.UTF-8. But that’s a different issue.)