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Re:Regarding the Em Dash by Freak_NL on Sunday January 07, 2018 @05:31AM (#16090260)
The compose key and its composition tables are a thing of beauty — you can even compose an uppercase ß (ss) these days: ẞ (SS). It's such a shame that neither Windows nor MacOS (or the mobile operating systems for that matter) provide this feature out-of-the-box.
Re:Regarding the Em Dash by acdha on Sunday January 07, 2018 @08:32AM (#16090790)
Mac OS has supported a similar system since the classic era – for example, https://en.wikipedia.org/wiki/Compose_key leads with Compose + ~ + n = ñ, which is Option + ~ + n on Mac OS.

https://forlang.wsu.edu/help-pages/help-pages-keyboards-os-x...

The newer system is simply holding down keys to see accented variants which feels very natural on touchscreen devices but is slower than keyboard shortcuts if you know them.

Re:Regarding the Em Dash by kps on Sunday January 07, 2018 @01:38PM (#16091956)
Mac layouts are arbitrary trees (or probably DAGs, but I've never checked) so it wouldn't be difficult to port an X Compose file.

(XKB manages to be both over-complicated and under-capable.)